Consider the state of a general market equilibrium of an economy, which is the state that aggregate demand of the economy is in equilibrium with aggregate supply of the economy. In the context of classical economics, the state is in conformity with Say's law that supply creates its own demand since the classical information space of an economy can be logically reduced to an aggregate production function. Keynes didn't agree to Say's law and thought that demand creates its own supply on the grounds of the neoclassical information space of an economy, which includes the agents other than the aggregate production function. Agents are psychological rather than completely rational such that we have an unstable macro-economy via the course of "demand creates its own supply." Nevertheless, as soon as the employment of men N is found in both Keynes' Aggregate supply function Z and Aggregate demand function D, we realize that the last resort that is underlying the state of a general market equilibrium of an economy in Keynes' theory, or more accurately, in neoclassical economics, remains the technology of production, i.e., the aggregate production function. There is a historical accumulation of capital related to the current state of production function but there is not a historical accumulation of capital related to the current state of market (institution) function, which might be the reason for methodologically the imbalance in macro-economic analysis, and which requires a revolution in the information space of an economy.
