Engels wrote in “Socialism Utopian and Scientific”: “We have seen that the ever-increasing perfectibility of modern machinery is, by the anarchy of social production, turned into a compulsory law that forces the individual industrial capitalist always to improve his machinery, always to increase its productive force. The bare possibility of extending the field of production is transformed for him into a similarly compulsory law. The enormous expansive force of modern industry, compared with which that of gases is mere child’s play, appears to us now as a necessity for expansion, both qualitative and quantitative, that laughs at all resistance. Such resistance is offered by consumption, by sales, by the markets for the products of modern industry. But the capacity for extension, extensive and intensive, of the markets is primarily governed by quite different laws that work much less energetically. The extension of the markets cannot keep pace with the extension of production. The collision becomes inevitable, and as this cannot produce any real solution so long as it does not break in pieces the capitalist mode of production, the collisions become periodic. Capitalist production has begotten another ‘vicious circle.’”
This famous quote was written when Marx was still alive. It passed his muster. Indeed, throughout their long partnership, the founders of scientific socialism described cyclical capitalist crises as crises of the general relative overproduction of commodities. However, most modern Marxist economists reject this idea. Among them is Anwar Shaikh.
Shaikh, in contrast to Marx and Engels, believes that the limit “modern industry” runs into is not the market but the supply of labor power. Marx and Engels believed that securing an adequate quantity of “free labor power” was crucial to the establishment of the capitalist mode of production. This was the big problem early capitalists faced, which was solved by separating the producers, often through force and violence, from their means of production. But once capitalism was firmly established, it has been the limit imposed by the limited ability of the market to grow relative to production that capitalism regularly runs up against.