In economics and in particular neoclassical economics, the marginal product or marginal physical productivity of an input (factor of production) is the change in output resulting from employing one more unit of a particular input (for instance, the change in output when a firm's labor is increased from five to six units), assuming that the quantities of other inputs are kept constant.
The marginal product of a given input can be expressed as:
Democratic capitalism, also referred to as market democracy, is a political and economic system that integrates resource allocation by marginal productivity (synonymous with free-market capitalism), with policies of resource allocation by social entitlement. The policies which characterise the system are enacted by democratic governments.
Democratic capitalism was implemented widely in the 20th century, particularly in Europe and the Western world after the Second World War. The coexistence of capitalism and democracy, particularly in Europe, was supported by the creation of the modern welfare state in the post-war period. The implementation of democratic capitalism typically involves the enactment of policies expanding the welfare state, strengthening the collective bargaining rights of employees, or strengthening competition laws. These policies are enacted in a capitalist economy characterized by the right to private ownership of property.
In economics, a production function gives the technological relation between quantities of physical inputs and quantities of output of goods. The production function is one of the key concepts of mainstream neoclassical theories, used to define marginal product and to distinguish allocative efficiency, a key focus of economics. One important purpose of the production function is to address allocative efficiency in the use of factor inputs in production and the resulting distribution of income to those factors, while abstracting away from the technological problems of achieving technical efficiency, as an engineer or professional manager might understand it.
For modelling the case of many outputs and many inputs, researchers often use the so-called Shephard's distance functions or, alternatively, directional distance functions, which are generalizations of the simple production function in economics.
Marginalism is a theory of economics that attempts to explain the discrepancy in the value of goods and services by reference to their secondary, or marginal, utility. It states that the reason why the price of diamonds is higher than that of water, for example, owes to the greater additional satisfaction of the diamonds over the water. Thus, while the water has greater total utility, the diamond has greater marginal utility.
Although the central concept of marginalism is that of marginal utility, marginalists, following the lead of Alfred Marshall, drew upon the idea of marginal physical productivity in explanation of cost. The neoclassical tradition that emerged from British marginalism abandoned the concept of utility and gave marginal rates of substitution a more fundamental role in analysis. Marginalism is an integral part of mainstream economic theory.