帝国主義論
In September 1917, Lenin published "Imperialism, the Highest Stage of Capitalism", which argued that imperialism was a product of monopoly capitalism, as capitalists sought to increase their profits by extending into new territories where wages were lower and raw materials cheaper. He believed that competition and conflict would increase and that war between the imperialist powers would continue until they were overthrown by proletariat revolution and socialism established. He spent much of this time reading the works of Georg Wilhelm Friedrich Hegel, Ludwig Feuerbach, and Aristotle, all of whom had been key influences on Marx. This changed Lenin's interpretation of Marxism; whereas he once believed that policies could be developed based on predetermined scientific principles, he concluded that the only test of whether a policy was correct was its practice. He still perceived himself as an orthodox Marxist, but he began to diverge from some of Marx's predictions about societal development; whereas Marx had believed that a "bourgeoisie-democratic revolution" of the middle-classes had to take place before a "socialist revolution" of the proletariat, Lenin believed that in Russia the proletariat could overthrow the Tsarist regime without an intermediate revolution.