Why was Karl Marx's argument that capitalists increased their wealth and not their money by extracting surplus labor value from workers a correct analysis?

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Marx argued that the value added by workers to goods and services was not fully compensated by the wages they received, and the surplus value generated by their labor was appropriated by the capitalists as profit. This surplus value was not a tangible asset that the capitalists owned, but a gain that resulted from the exploitation of the workers' labor power. Therefore, Marx's analysis correctly pointed out that capitalists enriched themselves by extracting surplus value from workers rather than by creating or accumulating money or property in the traditional sense.

Why Was Karl Marx's Argument That Capitalists Increased Their Wealth