„Capitalism is commodity production at the highest stage of development, when labor power itself becomes a commodity. The growth of internal exchange, and particularly of international exchange, is a special feature of capitalism. The uneven and spasmodic character of the development of individual enterprises, of individual branches of industry and individual countries, is inevitable under the capitalist system.“

— Vladimir Lenin

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„Admidst the colossal ruin of the country and the exhaustion of the forces of the proletariat, by a series of almost superhuman efforts, we are tackling the most difficult job: laying the foundations for really existing socialist economy, for the regular exchange of commodities (or, more correctly, exchange of products) between industry and agriculture.“
— Vladimir Lenin
„Imperialism - the era of bank capital, the era of gigantic capitalist monopolies, the era of the transformation of monopoly capitalism into state-monopoly capitalism - has particularly witnessed an unprecedented strengthening of the "state machine" and an unprecedented growth of its bureaucratic and military apparatus, in connection with the increase in repressive measures against the proletariat in the monarchical as well as in the freest republican countries.“
— Vladimir Lenin
„Cuba became the sugar-producing and-exporting country par excellence; and if she did not develop even further in this respect, the reason is to be found in the capitalist contradictions which put a limit to a continuous expansion of the Cuban sugar industry, which depended almost entirely on North American capital.“
— Ernesto Che Guevara