The problem of unfair competition in modern Russia is extremely acute and urgent. Every day arbitration courts consider a significant number of cases on this category of disputes, however, the situation does not change dramatically.Especially acute is the problem of legal regulation of anticompetitive agreements concluded by business entities. Despite the fact that the antimonopoly legislation has a history of more than twenty years, application of prohibitions on agreements which restrict competition is not as rich as, for example, application of prohibitions on abuse of dominant position or unfair competition. The casuistic legal technique of legislative regulation of anticompetitive agreements, their characteristics, procedures for proving their conclusion leads to conditions for the conclusion of impermissible agreements and leads to errors in the work of antimonopoly authorities both at the stage of approval of draft agreements and at the stage of prosecution of entities which have already concluded impermissible agreements.