Criticisms of neoclassical economics

Neo-classical economics has come under critique on the basis of its core ideologies, assumptions, and other matters.

Neoclassical economics is sometimes criticized for having a normative bias. In this view, it does not focus on explaining actual economies but instead on describing a "utopia" in which Pareto optimality applies. In the opinion of some developers of an alternative approach, the purpose of neoclassical economics is "to demonstrate the social optimality if the real world were to resemble the model", not "to explain the real world as observed empirically".

In his book Economics as Religion: From Samuelson to Chicago and Beyond, the economist Robert Nelson argued that "the priesthood of a modern secular religion of economic progress" has promoted a narrow interpretation of economic efficiency, disguised in the form of mathematics.

The assumption that individuals act rationally may be viewed as ignoring important aspects of human behavior. Many see the "economic man" as being quite different from real people. Many economists, even contemporaries, have criticized this model of economic man. Thorstein Veblen put it most sardonically. Neoclassical economics assumes a person to be,

a lightning calculator of pleasures and pains, who oscillates like a homogeneous globule of desire of happiness under the impulse of stimuli that shift about the area, but leave him intact.

Large corporations might perhaps come closer to the neoclassical ideal of profit maximization, but this is not necessarily viewed as desirable if this comes at the expense of neglect of wider social issues. The response to this is that neoclassical economics is descriptive and not normative. It addresses such problems with concepts of private versus social utility.

Problems exist with making the neoclassical general equilibrium theory compatible with an economy that develops over time and includes capital goods. This was explored in a major debate in the 1960s—the "Cambridge capital controversy"—about the validity of neoclassical economics, with an emphasis on the economic growth, capital, aggregate theory, and the marginal productivity theory of distribution. There were also internal attempts by neoclassical economists to extend the Arrow-Debreu model to disequilibrium investigations of stability and uniqueness. However a result known as the Sonnenschein-Mantel-Debreu theorem suggests that the assumptions that must be made to ensure that the equilibrium is stable and unique are quite restrictive.

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