In classical political economy and especially Karl Marx's critique of political economy, a commodity is any good or service ("products" or "activities"[1]) produced by human labour[2] and offered as a product for general sale on the market.[3] Some other priced goods are also treated as commodities, e.g. human labor-power, works of art and natural resources, even though they may not be produced specifically for the market, or be non-reproducible goods.