Winner-take-all system in the context of "Mixed-member proportional representation"

In political science, a multi-party system is a political system where more than two meaningfully distinct political parties regularly run for office and win offices (eg, membership in parliament) in elections. Multi-party systems tend to be more common in countries or jurisdictions (together, 'polities') which use proportional representation forms of election, compared to those that have implemented winner-take-all elections; this tendency is known as Duverger's law.

In multi-party countries or polities, usually no single party achieves at an election a parliamentary majority on its own (elections result in what are sometimes called hung parliaments). Instead, to craft a majority, multiple political parties must negotiate to form a coalition (also known as a 'minority government') which can command a majority of the votes in the relevant legislative organ of state (eg, parliamentary chamber). This majority is required in order to make laws, form an executive government, or conduct basically any of the necessary work of the parliament or the government (eg, to choose a president, elect parliamentary leadership, adopt a legislative agenda, or change rules of parliamentary procedure).

A two-party system is a political party system in which two major political parties consistently dominate the political landscape. At any point in time, one of the two parties typically holds a majority in the legislature and is usually referred to as the majority or governing party while the other is the minority or opposition party. Around the world, the term is used to refer to one of two kinds of party systems. Both result from Duverger's law, which demonstrates that "winner-take-all" or "first-past-the-post" elections produce two dominant parties over time.

The first type of two-party system is an arrangement in which all (or nearly all) elected officials belong to one of two major parties. In such systems, minor or third parties rarely win any seats in the legislature. Such systems exist, for example, in the United States, the Bahamas, Jamaica, and Zimbabwe. In such systems, while chances for third-party candidates winning election to major national office are remote, it is possible for factions within the larger parties to exert influence on one or even both of the two major parties.

The general ticket or party block voting (PBV), is a type of block voting in which voters opt for a party or a team of candidates, and the highest-polling party/team becomes the winner and receives 100% of the seats for this multi-member district. The party block voting is usually applied with more than one multi-member district to prevent one team winning all seats. This system has a winner-take-all nature similar to first-past-the-post voting for single-member districts, which is vulnerable to gerrymandering and majority reversals.

A related system is the majority bonus system, where a block of seats is awarded according to the winner of party-list proportional representation.