<Ul> <Li> History of competition law </Li> <Li> Monopoly <Ul> <Li> Coercive monopoly </Li> <Li> Natural monopoly </Li> </Ul> </Li> <Li> Barriers to entry </Li> <Li> Herfindahl--Hirschman Index </Li> <Li> Market concentration </Li> <Li> Market power </Li> <Li> SSNIP test </Li> <Li> Relevant market </Li> <Li> Merger control </Li> </Ul> <Li> History of competition law </Li> <Li> Monopoly <Ul> <Li> Coercive monopoly </Li> <Li> Natural monopoly </Li> </Ul> </Li> <Ul> <Li> Coercive monopoly </Li> <Li> Natural monopoly </Li> </Ul>

What was the effect of the sherman antitrust act