The classical conception of socialist economic planning held by Marxists involved an economic system where goods and services were valued, demanded and produced directly for their use-value as opposed to being produced as a by-product of the pursuit of profit by business enterprises. This idea of production for use is a fundamental aspect of a socialist economy. This involves social control over the allocation of the surplus product and in its most extensive theoretical form calculation-in-kind in place of financial calculation. For Marxists in particular, planning entails control of the surplus product (profit) by the associated producers in a democratic manner. This differs from planning within the framework of capitalism which is based on the planned accumulation of capital in order to either stabilize the business cycle (when undertaken by governments) or to maximize profits (when undertaken by firms) as opposed to the socialist concept of planned production for use.