The two-stage theory, or stagism, is a Marxist–Leninist political theory which argues that underdeveloped countries such as Tsarist Russia must first pass through a stage of capitalism via a bourgeois revolution before moving to a socialist stage.
[2] The two-stage theory is often attributed to Karl Marx and Friedrich Engels, but critics such as David McLellan[3] and others dispute that they envisaged the strict application of this theory outside of the actually existing Western development of capitalism.
[citation needed] Although all agree that Marx and Engels argue that Western capitalism provides the technological advances necessary for socialism and the "grave diggers" of the capitalist class in the form of the working class, critics of the two-stage theory, including most trends of Trotskyism, counter that Marx and Engels denied that they had laid down a formula to be applied to all countries in all circumstances.
McLellan and others cite Marx's Reply to Mikhailovsky: [Mikhailovsky] feels he absolutely must metamorphose my historical sketch of the genesis of capitalism in Western Europe into a historico-philosophic theory of the general path every people is fated to tread, whatever the historical circumstances in which it finds itself [...] but I beg his pardon.
)In the preface to the Russian edition of The Communist Manifesto of 1882, Marx and Engels specifically outline an alternative path to socialism for Russia.