Duverger's law of 2-party domination (Executive summary)

The two major political parties, Republicans and Democrats, have formed what amounts to an implicit cartel to reduce competition from third parties, and on the whole, it is very effective. – R.B.McKenzie & G.Tullock: The New World of Economics: Explorations into the Human Experience (Irwin Publications in Economics, 3rd ed, 1981), p. 169.

Lots more details

Duverger's own words in 1972

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