Marx's economic theory is based on his theory of the commodity and how profit is extracted as surplus value based on commodification. Thus, profit (along with profit rate) is the economic driver, which Marx expresses in the expression, M - C - M', meaning that financial investment of money–M–is used to produce commodities for consumption–C– that leads to return on investment as profit extracted as surplus value from the process–M'. Since this is not earned through productive work it is "economic rent" in the sense of classical economics, in which economic rent figured prominently. Marx did not come up with the idea. Rather, he sought to produce a more rigorous account of it.
Conventional monetary policy is based on keeping the interest rate lower than the profit rate, so as not create liquidity preference that overly encourages saving and stifles productive investment. While this may be a factor, it is not the factor, or even the most important factor, which is a reason that monetary policy doesn't work very well if relied on as a policy tool.
Michael Roberts argues that Keynesian fiscal policy that takes demand as the driver as is not necessarily successful either, since the driver isn't money rather than the interest rate. Rather, according to Marxian analysis, the issue is the inherent contradictions in the structure of capitalism as a modification of feudalism. Ownership of capital was substituted for, or melded with ownership of land as a source of rent extraction.
In this view, what is required is a entirely fresh approach based on removing the bias introduced by flawed institutional arrangements, especially bourgeois property ownership, that found the current system on expropriating surplus value as economic rent.
Such a system is not only unfair to workers, but it is also dysfunctional as an economic system. This dysfunctionality leads to political problems, which Marx believed could only be addressed through revolution, since the ownership class as he knew it then would never acquiesce to reform through the political process. But not much has changed in this regard, other than the appearances. The system still depends on rent extraction. What's new is financialization, digitization, and some of the forms that monopolization takes.
While may have conditions have changed drastically since Marx wrote, his analysis of capitalism and its discontents still holds the day, since it is a work in political economy rather than economic theory. Macroeconomics deals with socio-economic systems that involves much more than abstract economic relations since they are historical and dynamic.
Marx and other classical economists like Smith understood this. But the other classical economists were products of their class and remains essentially true to it. Marx, however, broke the mold in claiming that class was the problem. He concluded that an inherently dysfunctional system would either change or be changed. He did not think that the owners of the system would be up for change it themselves, based on noblesse oblige, for example.
Interestingly, Marx lived shortly after the American and French revolutions, which were still lively in memory and certainly shaped his thinking, especially since he was historically inclined having been trained in Hegel.
Now we see the uprising in France where La Marseillaise is again being sung in the streets, this time not against feudal rule but neoliberal.
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Michael Roberts