What are the advantages of an electoral system based on proportional representation?

give one party a majority over all other parties

Answer:

Proportional representation is seen by many as a method of ensuring that the makeup of an elected body represents the makeup of the electorate. In the case of multiple party elections where a "first place wins all" system is used, as are common in many areas, a member may be elected to represent an area but only represent a small percentage of the total voters (the majority may have, in fact voted "against" him). In a proportional system a party with 30% of the vote gets 30% of the seats. The electorate gives up some of its ability to choose specific representatives for the right to have sitting members for the party.