Czy prawa Duvergera nadal obowiązują?
Are the Duverger’s Laws still valid?

Summary/Abstract: The present paper analyses and empirically verifies a classical theory of a French political scientist, Maurice Duverger, which explains the relations between electoral and party systems. The Duverger’s theory being often discussed, interpreted, verified, criticised and at the same time corroborated, entered the canon of knowledge and for many decades set the directions of empirical studies on the relations between electoral and party systems. Duverger proudly named his theory a “true sociological law”. The aim of the paper is to evaluate Duverger’s assertions on the methodological and theoretical basis. To boot, it confronts predictions of the theory with the results of empirical research. Consequently, it will be possible to answer the eponymous, fundamental research question: Are the Duverger’s laws still valid?

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