In the late 60s, Mário Henrique Simonsen arrived at a view of inflation which he called 'Model of Inflationary Feedback'. This view included, under different names, certain notions that became popular in the 80s, such as inflationary shock, self-perpetuating inflation, and inflation institutionalized through indexation. Among eminent Brazilian economists, Simonsen was the first to defend the thesis that indexation hampers the effectiveness of the fight against inflation. From the early 70s on, he preached this thesis in his classes, his books, articles and speeches as a finance minister, stressing that, due to indexation, price rises in the past determined inflation in the present.