Concept:Representative systems tend to concentrate power in the hands of a few leaders over time.Explanation:Robert Michels is famous for proposing the “Iron Law of Oligarchy”.In 1911, he argued that even the most representative systems gradually deteriorate towards an Oligarchy or Patriarchy.He presented this argument in his well-known book Political Parties.Therefore, the name associated with this claim is Robert Michels.Answer:A. Robert Michels