“Page 643: By inflating the share of seats obtained by an ethnic party with a majority of votes, first-past-the-post can reduce ethnic minority representation to below proportional levels. By the same process of inflation, the plurality share of the largest or most cohesive minority can be translated into a majority of seats, sometimes at the expense of a less cohesive majority of voters. In these circumstances, proportional representation can change the result in one of two ways. If it reduces the vote-seat disparity, PR can prevent ethnic minority rule by denying a majority of seats to a party with a mere plurality of votes”