This is caused by a business cycle recession, and wages not falling to meet the equilibrium level.
The equilibrium level of income (Y e ) in the example, then, is £40 million.
If any of these should change, there will be an effect on the equilibrium level of income.
This 1980's experience brought many economists to the conclusion that 6 percent was the natural rate of unemployment, or equilibrium level.
Each of these operates to increase or reduce the equilibrium level of income in the economy.
As a consequence the equilibrium level of aggregate demand will fall.
However, in the long run it will drop to the equilibrium level.
The price control laws then resulted in prices that were significantly below their free-market equilibrium levels.
Consequently, per capita income will fall to previous low equilibrium level.
In other words, the mean acts as an equilibrium level for the process.