Formation and Success of New Parties

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Abstract
After describing the universe of 233 new parties formed in 19 West European and Anglo-American democracies from 1960 through 1980, the authors use data on those parties to address several hypotheses concerning system-level causes and conditions for new party formation and electoral success. It is found that although the propensi ty for forming new parties is not associated with structural variables, new party suc cess is related to the type of electoral system.