Like psychoanalysis and literary criticism, economics is now a completely discredited field that no sentient being takes seriously on its own terms. It only has a historical interest, as a collection of superstitions that were accepted in various epochs. The Marxist variety are important for the influence they had over a range of cultural forces, mostly artistic. The actual theories are a load of old crap, but 2 things need to be borne in mind: (1) the central fallacies are not original to Marx, and were simply taken over from preceding liberal windbags such as Locke, Smith and Ricardo, and (2) absolutely nothing written here has anything to do with the centrally-planned disasters of the old "communist bloc". None of Marx's remarks about the nature of a future communist economy were embodied in the USSR or elsewhere, nor did those countries make any attempt to manage the system using the concepts of labour-value. You can't blame him for all those deaths and all that waste and incompetence, though that's because (like all the others) he wrote about abstractions. The fact that his abstractions were not as ludicrously unreal as the ones entertained by the earlier bourgeois economists does not make them usefully better. It just means De Quincey had it right when he dismissed the whole field of political economy some years previously.
Karl Marx's writings' selection on economics was published by Pelican with the editing of Robert Freedman in 1961. Now, 62 years later, before 1 May Labour Day in the World, Karl Marx's book can be very useful during the pandemic crisis which spread especially in the capitalist industrial societies. When Karl Marx writes on economics, on the different concepts, relations or things of capitalist social development, he observes about everything (every objects, every products, every relationships of capitalist societies), Karl Marx's students think on about everything together with Karl Marx - Karl Marx's students like the student Karl Marx who studies on the social structure of his age in his writing. Karl Marx says that he studied on the all literature critically- since the ancient to the modern- about economic history of the world, he uses dialectical materialist method to conceptualize the capitalism - he works in the Aristotelian tradition. Karl Marx's writings on economics which began in his young works flow to his oldest works, we can follow Karl Marx's knowledge, thoughts, judgements for the economic history of the world.