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Revista de Economia Contemporânea

Print version ISSN 1415-9848On-line version ISSN 1980-5527

Rev. econ. contemp. vol.23 no.2 Rio de Janeiro  2019  Epub Aug 26, 2019 




Simone Maciel Cuiabanoa

aGeneral Coordinator of Public Interest, Secretariat for Foreign Trade, Ministry of the Economy of Brazil. Brasilia, DF, Brazil.


This paper estimates the fuel retailer cartel damages in the city of Londrina, Parana, part south of Brazil, using reduced and structural forms for supply and demand. Brazilian Competition Authority (CADE) documents help to characterize the ethanol and gasoline retailers involved in the collusion. The objective is to evaluate competition policy by comparing the amount of estimated damages with the amount of applied fines. This paper also adds an important result to gasoline substitution, as data shows ethanol is perceived as a perfect substitute and its price is inelastic. Results show an overcharge of 3.6% to 6.6% in the gasoline market and up to 12% in the ethanol market during collusion. Fines should consider the deterrence effect and, giving the low probability of detection, CADE’s applied fines seemed to be in line with this objective.

KEYWORDS: cartel; structural estimation; policy evaluation


Este trabalho estima os danos causados pelo cartel nos postos de gasolina na cidade de Londrina, Paraná, na região sul do Brasil, usando tanto uma equação, quanto um modelo estrutural de demanda e oferta. Documentos do Conselho Administrativo de Defesa Econômica (CADE) ajudam a caracterizar os postos envolvidos na colusão nos mercados de etanol e gasolina. O objetivo é avaliar os efeitos da política de concorrência comparando o montante do dano estimado com as multas aplicadas. Além disso, esse trabalho contribui para a literatura sobre substituição de gasolina, uma vez que os dados apontam que o etanol é percebido como substituto perfeito e tem preço inelástico. Os resultados mostram que houve um sobre custo causado pelo cartel de ordem de 4,6% a 6,6% no mercado de gasolina e de até 12% no mercado de etanol. As multas aplicadas, contudo, devem considerar a probabilidade de o cartel ser descoberto e, dada sua baixa probabilidade, as multas aplicadas no presente caso parecem estar alinhadas com esse objetivo.

PALAVRAS-CHAVE: cartel; estimação estrutural; avaliação de política


Increasingly, Competition Authorities (CA) around the world are quantifying the aggregate benefits of their activities as an impact assessment. In 2016, the Organization for Economic Co-operation and Development (OECD) launched a reference guide on ex-post evaluation of CA’ enforcement decisions. Those assessments are of growing interest since they demonstrate the ‘value for money’ of this public policy. In this article, I estimate the fuel retailer cartel damages in the south region of Brazil to compare with the amount of fines imposed by the Brazilian Competition Authority (CADE). As other jurisdictions, cartels are illegal in the country, being the participants subject to administrative and criminal investigations.2 The antitrust law determines that fines may be no less than the amount of harm resulting from the conduct. However, CADE has seldom resorted to this provision when determining fines; when done, the amount imposed was less than the equivalent of the maximum percentage of the defendant’s turnover allowed by the law.3

Investigation on antitrust violations in the fuel sectors have been a thorn in the side of most CA around the world (OECD, 2013). Although there is an understanding that fuels price volatility can be a result of other factors - i.e. demand or cost shocks, pricing strategies (ex. CLARK and HOUDE, 2013, 2014) - the lack of comprehension from general public may raise doubts on how efficient CA enforce the antitrust law. In the Brazilian experience, the amount of complaints in the fuel retail sector takes almost 1/4 of the workload of CADE. From 2005 to 2010, the institution received an average of 200 complaints per year only in this sector. However, the authority has condemned only 15 unions and fuel retailers’ in different municipalities until 2015 because of lack of direct proof (RAGAZZO and DA SILVA, 2006).

This work is related to two strands of literature: demand estimation for ethanol and its substitutability for gasoline, and cartel damage estimation. Anderson (2012) claims to be the first to provide estimates for ethanol elasticity and argues it is very sensitive to relative prices. This paper contributes to this finding, since cartelists pricing strategy required not only a raise in gasoline price, but also a drop in ethanol price in order to keep relative prices within a margin equivalent to fuel performance and stations distance to the city center. It also innovates with a database from the Brazilian ethanol market, the most consolidated flex fuel vehicles commercialization in the world.4

The literature on damage estimation is quite available since private claims started to be implemented both in the US and in Europe. Clark et al. (2004) was the first one to compile a cartel damage quantification study for the EC, giving a structured overview of the court decisions at the time of examination. Connor (2009) examined the antitrust litigation of the lysine cartel rather intensively and points to quantification problems. He emphasizes that the before and after method is rather critical in cases in which cartel formation took place after a recession and under such circumstances the benchmark might be understated and damages overstated, et vice versa. Dijk and Verboven (2007) also distinguish between damage quantification methods that use comparator indicators and methods that are based on direct information about the cartelized market. They also introduce critical loss analysis by determining the break-even point at which demand decreases, given a particular price increase, and, comparing this to the expected actual loss, cartel price overcharges were calculated.

The discussion about the deterrence effect of cartel fines is also a wide-raging scientific area that is directly related to the actual research. Various studies come to the conclusion that the deterring effects of corporate penalties indeed have been sub-optimal during the last years and that competition authorities have to employ detection in addition to deterrence mechanisms (CONNOR, 2009; HÜSCHELRATH and WEIGAND, 2010).

In Brazil, Lucinda and Seixas (2016) published a study on the damages calculation in the cartel of peroxides. She used three different methodologies (time series, difference in differences and a structural model) and observed that damages and fines are very similar in value terms. However, considering the importance of the deterrence effect, either the amount of fines should be raised or the same amount should be claimed by the judiciary as a compensating effect. As this is not yet implemented in the Brazilian system, it should be considered as a public policy instrument.

This work is divided in six parts, including this introduction. In session two, I review the main characteristics of the cartel in Londrina, using information provided in the condemnation files; session three describes the estimation methodology and presents some descriptive statistics available for the case; session four presents the main estimation results and the results of a general model of price effects in the ethanol and gasoline markets. Session five compares the results of estimated damages with the applied fines. Session six is the conclusion, in which I point out some outcomes that might be useful for future discussion of damage estimation and competition policy evaluation.



On the 12th of August of 2007,5 the Secretariat for Economic Defense (SDE)6 opened a cartel investigation after receiving a complaint from the State Policy of Parana informing about a criminal investigation relating fuel retailers in Londrina metropolitan area (cities of Londrina, Cambe, Jataizinho and Ibipora). The State Policy private call interception of the fuel distributor Oil Petro revealed the existence of collusion in the Londrina retail market. On August 29th, SDE, SEAE and the Parana policy deflagrated operation ‘Medusa III’, initiating the execution of search warrants in 16 retailers located in the above mentioned neighbors municipalities.7

Phone calls extracts and the questioning documents showed that collusion started when one of the retailers, located in a highway in the municipality of Cambe (‘Posto Paizao’ or Etiel Comercio de Combustiveis Ltda.), about 15 km from Londrina center, dropped ethanol price in the beginning of 2007. In response, one of its competitors (‘Rede Posto Carajas’ or Auto Posto Gasosan Ltda.), located 12.5 km from the center, also dropped its price, reaching the lowest level of R$ 0.94 per liter. This ‘price war’ started to attract drivers used to refuel in retailers located in Londrina city center, whose average price of ethanol ranged from R$1.39 to 1.74 per liter, and average price for gasoline ranged from R$ 2.39 to 2.55 per liter. Figure 1 illustrates the geographical distribution of the investigated retailers, in red. Green dots mark the presence of family relatives in fuel retail management, which started the talks on the price war. Table 1 describes the linear and drive distances from colluders to the city center.

Source: Elaborated with Google Maps.

Figure 1 Condemned fuel retailers locations 

Table 1 List of fuel retailers involved in the cartel and distances 

Retailer Linear distance (km) Drive distance (km) Drive time (minutes)
Auto Posto 10 de Dezembro Ltda. 1.5 2.7 7
Kalahan Comercio de Combustiveis Ltda. 3.4 7.1 12
Auto PostoExposição Ltda. 4.6 5.1 10
Etiel Comércio de Combustíveis Ltda. (Posto Paizão) 13.9 14.9 23
A. A. Fevereiro, Doino e Machado Ltda. 2.1 3.4 8
Auto PostoPaiaguás_Ltda. 2.6 3.8 7
AVN Comercio de combustiveisLtda-Me. 13.9 15.4 24
C.O. Bolognesi & Bolognesi Ltda. (Posto Tropical) 1.0 2.1 5
J Ramalho & Cia Ltda. (Auto Posto Versailles III) 10.9 11.6 19
Posto Novo Oriente Ltda. 0.5 1.3 5
Auto Posto Portelao Ltda. 10.6 11.6 19

Source: CADE Administrative Process 08012.011588/2007-30; Google API drive distance based on data for May 2017 from 8:30 am to 13:00 pm. I consider distance from Posto Transamerica, center located, as a benchmark.

In April/May, 2007, fuel retailer partners located in Londrina center started talking with the owners of the two firms in Cambe to agree on an end of the “price war”, combining the amount of price increases, price fixing8 and dates for readjustments. Cartel leaders intervened together with Londrina’s retailers, forcing9 all associates to agree on price stabilization. Following CADE’s documentation, the price uniformization policy did not require a large amount of effort since the condemned retailers were allegedly used as price reference to other fuel retailers in the region.

From the files, I observed that the cartel operated until the end of August 2007, when dawn raids and temporary arrest warrants were carried out. In the threats, fuel retailers decided that a ‘fair price’ in Cambe would be R$ 1.18 to ethanol and R$ 2.32 to gasoline, while in Londrina these prices would be aligned at R$ 1.33 and R$ 2.43.

These price differences between ethanol and gasoline are important to explain how apparently distant fuel retailers, i.e., non-competitors, suddenly became fiercely competitors and targets of other retailers. Ethanol is considered to be equal to gasoline when the per-liter price of the first reaches 70% of the per-liter price of gasoline. Even if gasoline and ethanol are priced about equally in $ per kilometer traveled, Salvo and Huse (2013) highlight there are consumers’ preferences over both fuels, such as consumers’ budget constraints (richer consumers prefer gasoline over ethanol), age and environment concerns, that might affect this substitutability.

For instance, one consumer making the choice on gasoline or ethanol, considering only price preferences, facing the lower bound of R$ 2.39 per liter, would compare the profitability of buying ethanol only if its price were lower than R$ 1.68. However, they would also need to consider if this price was being offered by the same station or in the neighborhood, otherwise they would need to consider transportation costs. Using a vehicle with a performance of 10Km per liter in gasoline and 7 km liter in ethanol, the 70% price difference would justify the choice of a 30km round trip to fill up a tank with 40 liters of ethanol - an economy of almost 50%. In CADE’s documents, one retailer owner in the city center confirmed that sales dropped by 300-500 liters a day, not clarifying, however, if these drops are related to gasoline or ethanol.

The cartel operated in two groups, the core one, coordinated by the Guarda family and two other price retailers, was responsible for determining and price monitoring. This involved the participation of a fuel distributor, Oil Petro, whose commercial manager, Mauro Guarda, kept vertical relations with one fuel retailer of the same name. The second group involved main fuel retailers in the cities of Londrina and Cambe, which were considered price makers because of their commercialized size. CADE’S documents show that these retailers accepted to participate in the agreement by changing their price in the date suggested by the core group, influencing the rest of fuel retailers to follow the leaders.

Apart from penal prosecution, CADE deliberated on penalties which summed up more R$ 10 million (US$ 5 million), described in the Appendix . The amount of fines was ruled based on art. 37 and 45 of the National Antitrust Law 12.529/2011, which can range from 0.1% to 20% from the total firm revenue. According to the Commissioner’s (FRAZAO, 2013, Decision in the Process 08012.011668/2007-30, v. 8), her decision of fixing a 13%-15% rate was based on the direct and indirect participation of the defendants. Although the law explicitly affirms that imposed fines should not be lesser than illegal profits, estimation difficulties impede CADE to proceed with this ruling more frequently.



In order to define the illegal profits and the damages of the cartel, I used CADE’S information to define its duration, from May to August 2007. Quantifying damages involves estimating the price that would have occurred in the absence of the cartel during the estimated period. For that, I need to characterize the market conditions for ethanol and gasoline demand in Londrina.

I start with a standard oligopoly model of competition that incorporates price discrimination over fuels and stations characteristics. As from obtained in cartel documents, retailers set they prices differently from which other, based on location and demand flow. These characteristics were observed even during the cartel period when they set prices differences up to the third decimal level. Considering that retailers operate in ethanol and gasoline, the individual firm profit function is:

πj=(pgwgcg)sg+(pewece)se (1)

Where pg,pe are the respective prices for gasoline and ethanol, wg,we are their respective wholesale paid price, and cg,ce is the retailer’s constant marginal cost of distribution for each fuel. Fuels specific market shares are given by sg,se . Cost shifters are such as the wholesale price, distance to city center, number of pumps and tankage size.

Assuming the existence of pure-strategy Bertrand-Nash equilibrium, the price for each fuel must satisfy the following first order conditions:

sg+(pgwgcg)sgpg=0 (2)

se+(pewece)sepe=0 (3)

Equations (2) and (3) imply that the vector γ of retailer’s margins is the retail price p minus the wholesale price w minus the marginal cost of distribution c :

γ=pwc (4)

Price-cost margins estimations require the observation of the demand shape to infer firm’s margins. Anderson (2012) develops a model of demand for ethanol as a gasoline substitute, in which the household will choose the fuel with the lower ethanol-equivalent price. Aggregate demand for both gasoline and ethanol will be a smooth function of relative prices when fuel-switching price ratios are distributed continuously. The log-linear aggregated demand equations for gasoline and ethanol are therefore:

lnQgit=g+β0lncarstβ1lnpgit+β2lnpeitβdlntimetravelin+εij (5)

lnQeit=e+β3lncarstβ4lnpeit+β2lnpgitβdlntimetravelin+εij (6)

In which, Qgit,lnQeit are both quantities of gasoline and ethanol sold by each station i in time t,pgjpej are the retailers price for gasoline and ethanol, timetravel10 captures the travel time period between i and n , the cartel leader in city center, ε is an index of unobserved station attributes. I will test whether travel distance from the city center to retailers located elsewhere may affect demand preferences as pointed out by Houde (2012).

Reduced form demand estimation equations for gasoline and ethanol prices in a panel for i retailers in time t are such as:

Pgit=0+β1Peit+β2timetraveljn+β3wg+β4cg+ij (7)

pejt=5+β6pgit+β7timetraveljn+β8we+β9ce+ijPejt=5+β6Pgit+β7timetraveljn+β8we+β9ce+ij (8)

In which w are costs related to the wholesale distributors and to other cost shifters, such as information on tankage size and if the retailer is unbranded. Once estimated parameters for each fuel I can include a dummy for the firms involved in the cartel during that specific time and use a linear estimator with random effects, such as:

Pgit=0+β1Peit+β2timetraveljn+β3wg+β4cg+φetadcartelIDg+ij (9)

Pejt=5+β6Pgit+β7timetraveljn+β8we+β9ce+φgasdcartelIDe+ij (10)

For the structural model, I estimate equations (5) and (6) using cost information such as the wholesale prices and tankage as instruments. I also include the average price for the 1 km competitors’ on gasoline and ethanol to control for price changes not related to the sold quantity. With the estimated elasticities, I can simulate the ‘but for price’ for each retailer considering its individual mark-up rules and wholesale costs.


I used the information in the file process to characterize cartelists and the cartel period. In addition, I aggregated three databases with information regarding fuel retailers in Londrina and Cambe11 obtained from the Brazilian Fuel Regulator (Agência Nacional do Petróleo, Gás Natural e Biocombustíveis - ANP): (i) an unbalanced weekly panel of retailers and wholesale prices for diesel, gasoline and ethanol from 2007 to 2009, including brand characteristics and georeferenced locations; (ii) a monthly panel of retailers acquired quantities of diesel, gasoline and ethanol also spanning from 2007 to 2009; (iii) a cross section of retailers characteristics such as numbers of pumps and tankage. Since this last makes reference to retailers in 2014, I also cross checked for information in ANP website12 regarding retailers which are no longer in operation, but whose characteristics are still available.

I obtained travel and time distances using Google API for each station regarding one fuel retailer located at the city center, but not mentioned in the files.13 I also added information regarding regional inflation rate for the period and control variables, such as total number of passenger’s cars. The sample includes prices and quantities for the sale of gasoline, ethanol and diesel in 154 fuel retailers in Londrina for a period of 36 months (3 years), totalizing 5,544 observations. Considering missing price data, however, I have only 443 completed information for gasoline and 440 completed information for ethanol.

For inflation, I consider the State of Parana index for Consumer Price (IPCA) provided by the Brazilian Institute of Statistics (IBGE). Other general price cost shifters, such as the international sugar price and petrol were obtained through the International Monetary Fund (IMF) statistics. The Parana State Department for Traffic Control (Detran/PR) provided Licensed vehicles in the city of Londrina and Cambe.

Tables 2 and 3 summarize the key variables. On average, fuel retailers in Londrina sold about 75,000 liters of gasoline, 50,000 liters of ethanol and 76,000 of diesel per month. However, these volumes changed along the years, remarked in 2009 when there was a 20% rise in the commercialization of ethanol and 18% of diesel compared to 2007.

Table 2 Summary Statistics on Volumes 

Overall 2007 2008 2009
Quantities (liter/month) Mean SD # Mean SD # Mean SD # Mean SD #
Gasoline 74,914 54,056 157 76,680 51,187 127 74,914 54,056 157 68,599 53,176 130
Ethanol 49,790 45,410 160 33,246 29,923 132 49,790 45,410 160 56,655 50,565 131
Diesel 76,271 13,3078 154 71,456 15,108 118 76,271 13,307 154 89,905 12,996 130

Source: own calculations.

The summary quantities statistics also highlight the amount of heterogeneity across stations in Londrina between 2007 and 2009. Gasoline had the highest standard deviations compared to the commercialization of diesel, for instance. But the commercialization of ethanol got increasingly dispersed along the years - standard deviation went from 30,000 liters in 2007 to 50,500 liters in 2009.

This heterogeneity is also caught by characteristics such as number of pumps and tanks. Overall, stations have more variation regarding the number of gasoline pumps and less for diesel, despite these last vary more in terms of tankage. Stations prosecuted for collusion, however, had more similar characteristics in terms of number of pumps of gasoline and ethanol, corroborating the information available in CADE’S files regarding the collusion in these two markets. On average, cartelists had three gasoline pumps and three ethanol pumps, while stores outside the cartel had six pumps for gasoline and four for ethanol. However, they had more pumps for diesel, reflecting the agreement choice for retailers located in the highway and used to have more clients for diesel. Stores in the cartel were also slightly geographically more spread in the same comparison as shown in Table 3.

Table 3 Summary Statistics on Prices and Characteristics 

Overall In collusion Not in collusion
Mean SD Mean SD Mean SD
Gasoline price (R$/Lt) 2.451 0.099 2.370 0.071 2.451 0.099
Ethanolprice (R$/Lt) 1.466 0.206 1.192 0.122 1.468 0.205
Diesel price (R$/Lt) 1.914 0.088 1.767 0.041 1.916 0.087
Pumps gas 5.047 3.056 3.857 2.762 5.055 3.057
Pumps ethanol 3.506 1.938 3.000 1.342 3.509 1.941
Pumps diesel 2.659 2.156 3.571 2.891 2.653 2.150
Tanks gasoline (liter) 32.118 12.473 25.000 10.607 32.167 12.472
Tanks ethanol (liter) 22.412 10.783 19.286 6.944 22.433 10.803
Tanks diesel (liter) 24.529 20.463 28.571 13.887 24.501 20.500
Distance (Km) 5.538 5.233 6.455 4.977 5.532 5.235
Drive distance (minutes) 10.859 6.591 11.636 6.823 10.854 6.590

Source: own calculations.

In terms of price, the overall price per liter for gasoline was R$ 2.45 (US$ 1.22) with a dispersion of 0.09 cents. During the cartel, colluding firms presented lower average gasoline price than non-colluding ones (0.08 cents difference); nevertheless, colluders presented lower dispersion. Similar patterns can be seen for ethanol and diesel prices: despite cartelists, ethanol and diesel prices were about R$ 0.27 and R$ 0.15 lower than non-cartelists, their variation across stations was much lower. The fact that these fuel stations were located far from the city center explains the lower average price. In addition, as documented in the files, cartelists have greater tankage in diesel, being an important part of total revenue.

One of the most important changes in the operations of the fuels market in Brazil concerns its business model. Until 1997, service stations were necessarily tied to distributors and carried their brands, acting in the market as franchise units. Thus, transactions between distributors and service stations occurred through loyalty contracts and negotiation exclusivity. Since deregulation, a new model has allowed the establishment of stations without supply contracts with a distributor. These are dubbed ‘unbranded’ or ‘white flag’ service stations, insofar as they are not franchises of any distributors. Most retailers in Londrina region declared themselves as white flags, as Table 5 shows. Retailers involved in the cartel were a majority of unbranded retailers (54%), which also helps to understand the lower price differences and the role of Oil Petrol, the regional distributor, as one of the leaders of the cartel.



As the cartel period and colluding firms are already known, reduced form estimations can help to give a glimpse on how much price were affected. Gasoline and ethanol prices are explained by costs and demand shifters such as distance (time to travel from the city center of Londrina to each retailer, including those in Cambe), if the store is not branded, tankage and number of pumps. I did not consider costs related to the commercialization of other fuels because 90% of the total stations traded both of them.

For gasoline, I tested different specifications in which the most robust includes retailer price information for ethanol. This is not a novelty in the Brazilian market because of fuels substitutability. Ethanol retailer price’s (‘PRECOVENDAETANOLd’) augmentation in 1 Real would cause an average rise of 0.089 cents in gasoline retailer’s price.14

Time to travel (‘time’) and travel distance to travel (‘dist’) seemed to be correlated, so I dropped one of them in the final specification. Travel distance from the city center presented the negative expected signs, though the magnitude of the impact was not very high: for each kilometer, there was a drop lower than one cent of Real. Here, I needed more information on commuting choices to better observe consumer’s choice.

Acquisition price from distributors (‘PRECOCOMPRAGASd’) represented the highest and most straightforward impacts on retailer’s prices: 1 Real of price increase from distributors had a direct pass-through effect over retailer’s prices, ranging from 1.04 to 1.05 price augmentation at the pump. On the other hand, the choice of being an unbranded store (‘d_branca’) did not seem to have much impact on retailers’ prices, which might indicate that a tacit collusion behavior was already in place in both municipalities. Storage capacity (‘tanks_gas’) is correlated with lower prices, as it was expected from literature. These effects, however, were strikingly lower compared to the positive coefficients of price increase, which might reflect managers’ capacity to avoid extra costs.

During the cartel, the price of the firms involved in collusion was 0.13 cents higher than other periods, including before and after the cartel. I cannot assume this as a direct effect of the cartel, though, since there are also effects associated with the cross price elasticity for the ethanol consumption.

Table 4 Reduced Price Demand Regressions for Gasoline 

Specification 1 2 3 4
Dependent: retail price of gasoline
Demand factors
Constant 0.1096105 0.1036447 0.0931006 0.043569
(0.043469) (0.0386335) (0.0386833) (0.0151887)
dist -0.0171896 -0.017215 -0.0170129 -0.002309
(0.0063476) (0.0062115) (0.0061915) (0.0008059)
time 0.00895 0.0090318
(0.0050273) (0.0049132)
Cost factors
PRECOCOMPRAGASd 1.053047 1.052917 1.049946 1.047202
(0.0205515) (0.0205155) (0.0204499) (0.0177587)
d_branca -0.0084004
PRECOVENDAETANOLd 0.0897138 0.0896416 0.0980785 0.0937471
(0.0288679) (0.0287533) (0.0269798) (0.0286924)
tanks_gas -0.0023663 -0.0022545 -0.0019947 -0.0014993
(0.0009149) (0.0008318) (0.0008364) (0.0008217)
dummyidcartel 0.1384666 0.1392501
(0.0629351) (0.0631914)
sigma_u 0.03668116 0.03356806 0.01212934 0.04053157
sigma_e 0.10310978 0.10473205 0.04987219 0.10356332
rho 0.11233969 0.09315895 0.05584701 0.13282551
R-squared (overall) 0.9989 0.999 0.999 0.9991

Source: Standard errors in (). 164 observations per estimation. Results at specifications 3 and 4 are significant at 1%.Source: own calculations.

For the structural demand estimation, I regressed equation (5) using the information on wholesale costs per retailer, the size of tankage and the average price of neighboring retailers in a 1 km ray as instruments. Price effects on quantities have the expected signs and it confirms the low price elasticity for gasoline in the region: a 1% price raise drops the demanded quantity in less than 0.6%. The effect of a price raise in ethanol increases the demand for gasoline also around 0.6%.15

Table 5 Demand Estimation for Gasoline 

Specification 1 2 3
Dependent: logarithm of gasoline quantity
_cons 25.55381 26.94924 26.84867
(6.698227) (6.828287) (6.840229)
lprecovendagas -0.4547253 -0.5590767 -0.5734533
(0.3077597) (0.3060727) (0.3066743)
lprecovendaetanol 0.5183416 0.5999931 0.6123401
(0.2816827) (0.2788484) (0.2793655)
lcars -1.182731 -1.291657 -1.303361
(0.5447383) (0.5551726) (0.5559122)
ltime 0.1144555
sigma_u 0.63035553 0.60124663 0.6053546
sigma_e 0.21563805 0.18700162 0.18835183
rho 0.89523489 0.91179696 0.91173498

Note: Standard errors in ().1. Instruments: lpm_conc_1km lprecocompragas; 2. lpm_conc_1km lprecocompragasltanksg; 3. lpm_conc_1km lprecocompragasltanksg.

Source: own calculations.

Overcharges can be calculated supposing the “but for price” is a result of a monopolistic competition in which retailers add a markup rule to wholesale costs, given its share:

pbutpriceit=costsgit+(sε) (11)

Overcharges in the structural model are also positive and significant, R$0.38 cents higher in average (9.8% overcharge, against 4.7% overcharge in the reduced form). Figure 2 compares both estimated, but for prices with the actual price charged by retailers.

Source: own calculations.

Figure 2 Gasoline actual sold prices and estimated competing prices 


In the ethanol price specifications, I included both the same demand variables as in gasoline (‘dist’ and ‘time’). For cost shifters, I also included the acquisition price of ethanol from distributors (‘PRECOCOMPRAETANOLd’) as well as the gasoline substitute effects (‘PRECOVENDAGASd’). The main difference is the inclusion of the index of the international sugar price (‘sugar’) to the analysis, since the same cane is used for sugar or ethanol production. In Brazil, producers have a flexibility to switch between sugar and ethanol and the use of cane was about 50% to 50% until 2006. From then, industry growth switched to ethanol due to an increasing number of FFV vehicles and an increased demand for fuel ethanol. However, producer’s decisions on the supply of ethanol are highly dependent on the future prospective price for sugar. For instance, sugar mix was maximized in 2011 and 2012 due to high global sugar prices, leading to a lower supply of ethanol (COVRIG, 2014).

The impact of sugar prices on retailers’ was positive and significant in specifications 3 and 4. Although in specification 1 the sign was negative, this one did include extra variables that I dropped in other regressions due to lower explanatory power, such as time and distance. As in the gasoline regressions, travel distance had a negative effect on ethanol’s price, but with the same low magnitude impact.

Information on the unbranded store (‘d_branca’) also did not bring information on prices, so I dropped in the last specifications, as well as the information on the number of ethanol pumps (‘bicos_eta’).

Acquisition price from distributors (‘PRECOCOMPRAETANOLd’) also did seem to have a direct effect on retailers’ prices, though in a much smaller magnitude than gasoline costs pass-through. This might be a reflex of consumers’ preferences for the later and firms’ ability to absorb some of the costs in order to avoid excessive stocks for the product. Gasoline retail price augmentation (‘PRECOVENDAGASd’), on the other hand, had a higher pass-through on ethanol’s price than the effect of the ethanol price on gasoline. This shows that retailers pricing strategies consider not only costs, but also demand preferences and substitution. A higher gasoline retail price allows firms to raise more ethanol’s price than the opposite, respecting the fuel efficiency thumb rule of 70% of ethanol/gasoline.

During collusion, ethanol prices were 0.038 cents lower than prices out of that period. Although this might seem controversial, it may reflect firms pricing strategy to keep gasoline and ethanol prices balanced and to keep a stable revenue for colluders. Remembering that the cartel started after a ‘price war’ in the ethanol market, in which the revenue of competitors firms was lowering because of consumers’ gasoline substitution. By lowering ethanol prices to a certain level, cartelists kept the amount of gasoline and ethanol sales.

Table 6 Reduced Price Demand Regressions for Ethanol 

Specification 1 2 3 4
Dependent: retail price of ethanol
Demand factors
_cons 0.2293977 -0.6820153 -0.7618369 -0.7903439
(0.1088252) (0.1000504) (0.0948181) (0.0952531)
dist 0.0030712 0.0105773 -0.0050015
(0.0134118) (0.0080061) (0.0023574)
time -0.0052832 -0.013321 -0.0053529
(0.0110065) (0.006522) (0.0018683)
PRECOCOMPRAETANOLd 1.161412 0.4200158 0.3800242 0.3804374
(0.0207021) (0.0603231) (0.0548631) (0.0564332)
d_branca 0.1917472 0.048704
(0.0469142) (0.0323915)
PRECOVENDAGASd 0.4033752 0.4252455 0.4249725
(0.0317775) (0.0290005) (0.0298097)
tank_eta -0.0032696 -0.0022551 -0.002262 -0.0025557
(0.0020202) (0.001217) (0.0011911) (0.0012002)
sugar -0.0049045 0.0535773 0.0575578 0.0578314
0.0066979 0.0064634 0.0059689 0.0060654
dummyidcartel -0.0382886
sigma_u 0.08968003 0.00690577 0 0
sigma_e 0.18962417 0.13691181 0.14413066 0.14483054
rho 0.18278497 0.00253769 0 0
R-squared (overall) 0.9846 0.9899 0.9932 0.9932

Notes: Standard errors in (). Results are significant at 1%.

Source: own calculations.

Price elasticity for ethanol was quite similar to the one obtained for gasoline, showing that the products are perceived as substitutes (-0.57 and -0.55). In both gasoline and ethanol estimations, travel distance was associated with a positive effect on quantities. Since I do not have information on commuters, it is inconclusive whether there is larger demand for retailers located outside of the city center, as it might indicate.

Table 7 Demand Estimation for Ethanol 

Specification 1 2 3
Dependent: logarithm of ethanol quantity
_cons -40.45567 -43.16309 -40.73871
(13.92972) (17.50656) (13.93184)
lprecovendagas 0.6206255 1.105276 0.6165984
(0.6998246) (0.8535769) (0.7000006)
lprecovendaetanol -0.5546346 -1.022595 -0.5548431
(0.6414875) (0.7785791) (0.6415611)
lcars 4.206299 4.40747 4.205395
(1.129817) (1.419404) (1.129979)
ltime 0.1383563
sigma_u 0.6769464 0.65156218 0.68346768
sigma_e 0.41989428 0.45186623 0.42284094
rho 0.72215537 0.67523815 0.72319519

Note: Standard errors in ().1. Instruments: lpm_conc_1km lprecocompragas; 2. lpm_conc_1km lprecocompragasltanksg; 3. lpm_conc_1km lprecocompragasltanksg.

Source: own calculations.

Using the structural demand, calculated overcharges were of R$ 0.38 cents for ethanol (16% over estimated prices), against the price reduction observed in the reduced form. This impacts damages estimation and fines calibration, as I show in the next session.

Source: own calculations.

Figure 3 Ethanol actual sold prices and estimated competing prices 


In order to calculate estimated damages with the results from the reduced and structural approaches, I must consider the net cross effects of the coefficients of both gasoline and ethanol retailers’ price in each other. For instance, one Real increase in ethanol price was related to R$ 0.0937471 cents rise in the gasoline price. Considering the hypothesis that colluders dropped ethanol price by -0.0382886, keeping the same proportionality, it is equivalent to assume that the net gasoline price augmentation was of R$ 0.135. For ethanol, it was about R$ 0.02.

Worth to say that price overcharges were in line with the observed in refereed literature, such as in Connor and Bolotova (2006). There are studies about overcharge proportion being related to oligopolistic environments and higher barriers to entry.16 As fuel retail is neither one of them, lower cartel overcharge is expected. This finding also reflects colluder’s preoccupation in setting the “right” price for which retailer considering differences up to the third decimal level.17

Table 8 Overcharges estimations in the reduced form (R$) 

Cartel Overcharge (“dummyidcartel”) Cross price coefficients Priceeffect Net effect But for prices (average) Net Overcharge
Gasoline 0.139 0.093 -0.003 0.135 3.798 3.60%
Ethanol -0.038 0.424 0.059 0.020 2.430 0.86%

Source: own calculations.

Table 9 Overcharges estimations using Structural form (R$) 

Cartel excessive price Without cross effects Overcharges Without cross effects But for prices Without cross effects But for prices (average) Net Overcharge
Gasoline 0.389 9.849% 3.537 3.658 6.68%
Ethanol 0.382 16.325% 1.957 2.028 12.5%

Source: own calculations.

To calculate the damages, one must consider the total quantity sold by each firm at the period; however, this information is not available for all the firms in collusion, which might lead to underestimated effect. Considering that involved retailers were also price leaders, regulating prices setting in the city, I estimate damages considering the total volume sold both in the gasoline and ethanol markets during the cartel period. Table 10 shows calculated damages considering reduced and structural estimations and its cross effects. Results from the last form show a higher damage than the reduced form. Total amount of damages were not very high especially because of the low duration of the cartel (3 months).

Table 10 Damages estimations (in R$) 

Reduced form Structural form With cross-effects (R) With cross-effects (E)
Gasoline 134,515.8 457,936 131,048.3 295,352.8
Ethanol -10,644.23 117,001.2 -15,167.73 92,648.25
Total 123,871.57 574,937.20 115,880.57 388,001.05

Source: own calculations.

The amount of CADE’S fine summed up R$ 10,964,962.2. This is 20 times higher than the highest estimated damages. Optimal deterrence theory claims that fines should be inversely proportional to the probability of being discovered in crime. If firms exclusively think about collusion as an economic decision to increase profits and refrain from ethical principles, the question to be answered is whether the gain from price fixing outweighs expected punishments. The probability of detection is very difficult to assess, although some studies tried that. The research of Allain et al (2013) reviews the main papers that tried to assess these probabilities, ranging from 10% to 33%, consistent with the probability of detection for other crimes. Using this information to evaluate applied fines, I observe that Cade’s policy choice in the case seemed to be higher with the expected deterrence effect, considering damages, dawn raid costs and the probability of being caught. However, CADE’S policy reflected a deterrence effect of 5%, which may be considered a more realistic to the authority’s capacity of cartel detection, given the proportionality of the authority to the country dimensions.

Table 11 Fines (punishment) considering the probability of detection 

Probability of being caught Penalty1 Penalty2 Penalty3 Penalty4
0.05 2 477 431.40 11 498 744.00 2 317 611.40 7 760 021.00
0.1 1 238 715.70 5 749 372.00 1 158 805.70 3 880 010.50
0.15 825 810.47 3 832 914.67 772 537.13 2 586 673.67
0.3 412 905.23 1 916 457.33 386 268.57 1 293 336.83

Source: own calculations.

6. Final Considerations

The necessity to evaluate public policies is an important issue to justify the amount of investment done in one matter. The analysis of cartel punishment effects is one way to verify how Competition Authorities are currently dealing with such crimes, considering that they are hard to detect and that investigations require financial and human resources expenses. The above analysis is a first insight to provide a view of how appropriate are the actual fine decisions done by the Brazilian Competition Authority.

Under Brazil’s current competition law, cartel fines may vary from 0.1 to 20 percent of the companies’ revenue from the year before the conduct began. The law also says fines should never be lower than the benefits companies received from the conduct - when it is possible to calculate such benefits. However, these calculations are not straightforward; so, more time should be given to the evaluation of past condemned cartels fines considering the estimated damages. So far, this is the second study on cartel damages done in Brazil. Considering that the first study did not point to any deterrence effects of the applied policy, the estimations presented above do show that applied fines ended up considering it. The results here obtained may also help the Authority in the dosimeter fines calculations, which may have to consider not only the gravity of the conduct, but the industry characteristics. Industries with lower participants may be object of higher fines than colluding firms in a more oligopolistic environment.

In addition to competition policy debate, this paper also contributed to the fuel substitutability debate. Ethanol is perceived as a perfect substitute for gasoline. Subsidies for the promotion of this fuel as a more ecological friendly fuel might not achieve the wanted substitution effect if firms pricing strategy consider the ethanol equivalent fuel price in gasoline.

Future work, though, must consider a different specification of the demand choices for retailers, especially taking into account that neighbor’s stores must have a greater impact on prices than distant ones. The demand characterization for both fuels (gasoline and ethanol) might allow a better assessment over the price cost margins through a structural simulation using the hypothesis that stations choices are differentiated goods.


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JEL CODES: L41; L71; D43.

1Author would like to thank ANP’s Superintendent for Competition Defense and Economic Regulation team and the Department of Economic Studies of CADE for the provision of data and other innumerous support. The views expressed here are those of the author and do not necessarily represent the views of the Ministry of the Economy of Brazil

2Article 36 of Law 12,529/2011 sets forth the basic framework for anticompetitive conduct in Brazil. Criminal cartel investigations are responsibility of the Federal Prosecution Bureau and ruled by the Supreme Court.

3Antitrust Law determines fines against the companies may range from 0.1 to 20 % of the company’s or group of companies’ pre-tax turnover in the economic sector affected by the conduct, in the year prior to the beginning of the investigation. This has been used as a rule of thumb by CADE’s Tribunal due to the difficulties in harm estimation.

4By 2007, when the cartel was in place, 69% of the total passenger vehicles in Brazil were flex-fuel (ANFAVEA, 2008).

5 CADE convicted 15 cartels involving fuel retailers up to 2015. Most of them related to the price liberalization transition period (1999-2004), but retailers price for that period are not available (BRAZIL (2014).

6The competition system in Brazil was composed of three organizations until 2012: the Secretariat of Economic Monitoring (SEAE), attached to the Ministry of Finance, responsible for merger and acquisitions instructions; the Secretariat of Economic Law (SDE), attached to the Ministry of Justice, which instructed cases related to collusion and antitrust violation’s complaints; Council of Administrative Economic Defense (CADE), the Court which decided on merger consolidation and antitrust violations condemnations.

7Process number of reference 08012.0116681/2007-30 (BRAZIL, 2010).

8The agreement went up to the 2nd decimal level price combination in which some retailers could raise or drop their prices up to R$0.03, adjusting it to demand changes.

9The pressure involved physical threatening, verbal abuse and harassment of retailers.

10Data collect on May 13, 2017 from 8:30am to 2pm, local time of Londrina.

11ANP price collection methodology does not include Ibipora or Jataizinho, due to its sample size. Price and quantity information for each gas station are not available in the disclosured process files.

12Available at: <>.

13Posto Transamerica, CNPJ 07.775.477/0001-98.

14Nearly 50% of the vehicles in the State of Parana had the flex-fuel technology already in place (MINISTRY OF ENVIRONMENT, 2011, graphic 70, p. 90).

15Levin, Lewis and Wolak found lower elasticities in the US estimating demand using higher levels of spatial and temporal aggregation.

16 Bolotova et al. (2008) have a nice overcharge/industry characteristic correlation analysis.

17In one of the dialogues between Djalma Guarda Junior and Djalma Guarda, both son and father, the first insists to correct that agreed ethanol price was 1.269, not 1.259, as the father believed.


List of Condemned Fuel Retailers and Managers 

Fines (R$)
1. AVN Comércio de Combustíveis Ltda. (Auto Posto Bonanza) 610 314.46
2. Mazzarelo& Cia Ltda. (Auto Posto Flamboyant) 851 280.00
3. OílPetro Brasileira de Petróleo Ltda. 851 280.00
4. DGJR Comércio de Combustíveis Ltda. (Posto Versailles e Posto Versailles II) 851 280.00
S. J Ramalho & Cia Ltda. (Auto Posto Versailles III) 851 280.00
6. Auto Posto 10 de Dezembro Ltda. 851 280.00
7. Posto_ Novo _Oriente Ltda. 851 280.00
8. C.O. Bolognesi & Bolognesi Ltda. (Posto Tropical) 851 280.00
9. Auto Posto Paiaguás_Ltda. 487 134.86
10. Etiel Comércio de Combustíveis Ltda. (Posto Paizão) 744 870.00
11. Auto Posto Brasília de Londrina Ltda (Posto Meninão) 744 870.00
12. Auto Posto Exposição Ltda. 744 870.00
1. Mauro Cesar Guarda 255 384.00
2. Jonatas Cerqueira Guarda 127 692.00
3. Claudir_Osmir Bolognesi 255 384.00
4. Itauby Netto José Ramalho 255 384.00
5. Djalma Eugênio Guarda 346 931.17
6. Djalm aEugênio Guarda Júnior 79 340.88
7. Sergio Goes_de_Oliveira 290 499.30
8. Edson Fernandes Gimenes 63 327.53
TOTAL 10 964 962.20

Source. CADE Administrative Process 08012.011588/2007-30

Received: March 08, 2018; Accepted: April 09, 2019

Corresponding Author: Simone Cuiabano E-mail address:

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