The article discusses Marx's theory of value and how commodities, including labor, can sell at their value and still make a profit for capitalists. It defends Marx's theory against critics and explores how abstract concepts like socially necessary labor time relate to prices in the capitalist market. The author also looks at how changes in capitalism, like monopoly-capitalism and the gold standard, impact prices. Overall, the article extends Marx's theory to analyze capitalism's current direction without being constrained by traditional views.