The idea of under-employment equilibrium is explained in the

Question

Accepted Answer

The correct option is 2:

The idea of under-employment equilibrium is a cornerstone of modern macroeconomics, introduced by John Maynard Keynes in his seminal work, *The General Theory of Employment, Interest and Money* (1936). Under-employment equilibrium refers to a situation where the economy is in a state of rest or stability, but at a level of national income and output where not all available resources, particularly labour, are fully employed. In simple terms, the economy can settle at an equilibrium point despite persistent unemployment. Keynes argued that this occurs when aggregate demand (AD) is insufficient to absorb the full capacity output. Since wages and prices are rigid downwards (due to factors like labour unions and fixed contracts), the economy cannot automatically adjust to the full employment level, thus making under-employment equilibrium a real possibility.

The incorrect option is 1:
The Classical Approach, which dominated economic thought before Keynes, strictly believed in the concept of full employment equilibrium. Classical economists adhered to Say's Law ("Supply creates its own demand") and argued that market mechanisms, primarily flexible wages and prices, would automatically ensure that any unemployment would only be temporary and voluntary, thus ruling out the possibility of a stable equilibrium with under-employment.

The incorrect option is 3:
The Pre-Keynesian Approach is essentially synonymous with the Classical Approach in this context. Before Keynes, the dominant macroeconomic paradigm was the classical model, which assumed that the economy naturally gravitates toward and stays at full employment through automatic self-correcting mechanisms. Therefore, this approach also rejects the notion of under-employment equilibrium.

The incorrect option is 4:
This option is incorrect because neither the Classical Approach (Option 1) nor the Pre-Keynesian Approach (Option 3) accepts or explains the concept of under-employment equilibrium. This idea is uniquely a contribution of the Keynesian framework.