The Marxist concept of 'fetishism of commodities,' articulated by Karl Marx in 'Das Kapital,' describes a peculiar social phenomenon within capitalist societies where commodities appear to have an inherent, mystical value independent of the human labor that produced them. It's a form of reification where social relations between people involved in production are transformed into social relations between things (the commodities themselves).

In pre-capitalist societies, the value of goods was more directly tied to the labor expended by the producer and the immediate social relations of exchange. However, under capitalism, the market mediates these relations. When we buy a product, we typically don't see the labor conditions, the wages paid, or the social struggles involved in its creation. Instead, the commodity appears as an object with a natural, intrinsic value, often expressed in its price. This obscures the complex web of human labor, exploitation, and social relations that underpin its production.

Marx argued that commodity fetishism mystifies the true nature of capitalist production. It makes the products of labor seem to possess a life of their own, dictating social relations rather than being products of human activity. This illusion prevents individuals from recognizing their collective power as producers and obscures the exploitative nature of wage labor. By focusing on the exchange value of commodities rather than their use value or the labor embedded within them, capitalism fosters an alienated relationship between producers, consumers, and the products of their labor, making the economic system appear natural and inevitable rather than a specific historical construct.