This article assesses the role of intermediaries in the performance of the cassava market in the East region of Cameroon. To ensure the representativeness of men and women, research on the different markets of this region was done according to a reasoned choice and on the basis of a random and systematic sampling. In order to assess the performance of the markets, the Gini index and its representation by the Lorenz curve were used. Also, to measure the effect of intermediaries, we used Aker's model (2010). The results of our study reveal that markets perform well when there are intermediaries at several stages in the marketing chain. In addition, a high number of intermediaries in a market will have the effect of reducing prices in that market. Thus, in order to influence the dynamics of market performance, it is necessary to intervene in policies to improve agricultural intermediation, in particular through the policies of standardization and security of the intermediary function.