Defference between major polarity and voting system
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A plurality vote (in the United States) or relativemajority (in the United Kingdom and Commonwealth) describes the circumstance when a candidate or proposition polls more votes than any other but does not receive more than half of all votes cast.
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Plurality- The plurality system is the simplest means of determining the outcome of an election. To win, a candidate need only poll more votes than any other single opponent; he need not, as required by the majority formula, poll more votes than the combined opposition. The more candidates contesting a constituency seat, the greater the probability that the winning candidate will receive only a minority of the votes cast. Countries using the plurality formula for national legislative elections include Canada, Great Britain, India, and the United States. Countries with plurality systems usually have had two main parties.
Majority system- Under the majority system, the party or candidate winning more than 50 percent of the vote in a constituency is awarded the contested seat. A difficulty in systems with the absolute-majority criterion is that it may not be satisfied in contests in which there are more than two candidates. Several variants of the majority formula have been developed to address this problem. In Australia the alternative, or preferential, vote is used in lower-house elections. Voters rank the candidates on an alternative-preference ballot. If a majority is not achieved by first-preference votes, the weakest candidate is eliminated, and that candidate’s votes are redistributed to the other candidates according to the second preference on the ballot. This redistributive process is repeated until one candidate has collected a majority of the votes. In France a double-ballot system is employed for National Assembly elections. If no candidate secures a majority in the first round of elections, another round is required. In the second round, only those candidates securing the votes of at least one-eighth of the registered electorate in the first round may compete, and the candidate securing a plurality of the popular vote in the second round is declared the winner. Some candidates eligible for the second round withdraw their candidacy and endorse one of the leading candidates. In contrast to the two-party norm of the plurality system, France has what some analysts have called a “two-bloc” system, in which the main parties of the left and the main parties of the right compete against each other in the first round of an election to be the representative of their respective ideological group and then ally with one another to maximize their bloc’s representation in the second round. An infrequently used variant is the supplementary-vote system, which was instituted for London mayoral elections. Under this system, voters rank their top two preferences; in the event that no candidate wins a majority of first-preference votes, all ballots not indicating the top two vote getters as either a first or a second choice are discarded, and the combination of first and second preferences is used to determine the winner. Majority formulas usually are applied only within single-member electoral constituencies.
The majority and the plurality formulas do not always distribute legislative seats in proportion to the share of the popular vote won by the competing parties. Both formulas tend to reward the strongest party disproportionately and to handicap weaker parties, though these parties may escape the inequities of the system if their support is regionally concentrated. For example, in national elections in Britain in 2001, the Labour Party captured more than three-fifths of the seats in the House of Commons, even though it won barely two-fifths of the popular vote; in contrast, the Conservative Party won one-fourth of the seats with nearly one-third of the vote. Third-party representation varied considerably; whereas the Liberal Democrats, whose support was spread throughout the country, captured 8 percent of the seats with more than 18 percent of the vote, the Plaid Cymru, whose support is concentrated wholly in Wales, won 0.7 percent of the vote and 0.7 percent of the seats. The plurality formula usually, though not always, distorts the distribution of seats more than the majority system.
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Plurality- The plurality system is the simplest means of determining the outcome of an election. To win, a candidate need only poll more votes than any other single opponent; he need not, as required by the majority formula, poll more votes than the combined opposition. The more candidates contesting a constituency seat, the greater the probability that the winning candidate will receive only a minority of the votes cast. Countries using the plurality formula for national legislative elections include Canada, Great Britain, India, and the United States. Countries with plurality systems usually have had two main parties.
Majority system- Under the majority system, the party or candidate winning more than 50 percent of the vote in a constituency is awarded the contested seat. A difficulty in systems with the absolute-majority criterion is that it may not be satisfied in contests in which there are more than two candidates. Several variants of the majority formula have been developed to address this problem. In Australia the alternative, or preferential, vote is used in lower-house elections. Voters rank the candidates on an alternative-preference ballot. If a majority is not achieved by first-preference votes, the weakest candidate is eliminated, and that candidate’s votes are redistributed to the other candidates according to the second preference on the ballot. This redistributive process is repeated until one candidate has collected a majority of the votes. In France a double-ballot system is employed for National Assembly elections. If no candidate secures a majority in the first round of elections, another round is required. In the second round, only those candidates securing the votes of at least one-eighth of the registered electorate in the first round may compete, and the candidate securing a plurality of the popular vote in the second round is declared the winner. Some candidates eligible for the second round withdraw their candidacy and endorse one of the leading candidates. In contrast to the two-party norm of the plurality system, France has what some analysts have called a “two-bloc” system, in which the main parties of the left and the main parties of the right compete against each other in the first round of an election to be the representative of their respective ideological group and then ally with one another to maximize their bloc’s representation in the second round. An infrequently used variant is the supplementary-vote system, which was instituted for London mayoral elections. Under this system, voters rank their top two preferences; in the event that no candidate wins a majority of first-preference votes, all ballots not indicating the top two vote getters as either a first or a second choice are discarded, and the combination of first and second preferences is used to determine the winner. Majority formulas usually are applied only within single-member electoral constituencies.
The majority and the plurality formulas do not always distribute legislative seats in proportion to the share of the popular vote won by the competing parties. Both formulas tend to reward the strongest party disproportionately and to handicap weaker parties, though these parties may escape the inequities of the system if their support is regionally concentrated. For example, in national elections in Britain in 2001, the Labour Party captured more than three-fifths of the seats in the House of Commons, even though it won barely two-fifths of the popular vote; in contrast, the Conservative Party won one-fourth of the seats with nearly one-third of the vote. Third-party representation varied considerably; whereas the Liberal Democrats, whose support was spread throughout the country, captured 8 percent of the seats with more than 18 percent of the vote, the Plaid Cymru, whose support is concentrated wholly in Wales, won 0.7 percent of the vote and 0.7 percent of the seats. The plurality formula usually, though not always, distorts the distribution of seats more than the majority system.
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