Production for use is a phrase referring to the principle of economic organization and production taken as a defining criterion for a socialist economy. It is held in contrast to production for profit. This criterion is used to distinguish socialism from capitalism, and was one of the fundamental defining characteristics of socialism initially shared by Marxian socialists, evolutionary socialists, social anarchists and Christian socialists.
This principle is broad and can refer to an array of different configurations that vary based on the underlying theory of economics employed. In its classic definition, production for use implied an economic system whereby the law of value and law of accumulation no longer directed economic activity, whereby a direct measure of utility and value is used in place of the abstractions of the price system, money, and capital. Alternative conceptions of socialism that don't utilize the profit system such as the Lange model involve the use of a price system and monetary calculation.
The central critique of the profits system by socialists is that the accumulation of capital ("making money") becomes increasingly detached from the process of producing economic value, leading to waste, inefficiency, and social issues. Essentially it is a distortion of proper accounting based on the assertion of the law of value instead of the "real" costs of the factors of production, objectively determined outside of social relations.
Production for use refers to an arrangement whereby the production of goods and services is carried out ex ante (directly) for their utility (also called Use-value). The implication is that the value of economic output would be based on use-value or a direct measure of utility as opposed to exchange-value; because economic activity would be undertaken to directly satisfy economic demands and human needs, the productive apparatus would directly serve individual and social needs. This is contrasted with production for exchange of the produced good or service in order to profit, where production is subjected to the perpetual accumulation of capital, a condition where production is only undertaken if it generates profit, implying an ex post or indirect means of satisfying economic demand. The profits system is oriented toward generating a profit to be reinvested into the economy (and the constant continuation of this process), the result being that society is structured around the need for a perpetual accumulation of capital. In contrast, production for use means that the accumulation of capital is not a compulsory driving force in the economy, and by extension, the core process which society and culture revolves around. Production for profit, in contrast, is the dominant mode of production in the modern world system, equivocates "profitability" and "productivity" and presumes that the former always equates to the latter.