Core Economic Definitions & Theoretical Mechanisms
Classical economics assumes flexible prices and wages, relying on Say’s Law (‘supply creates its own demand’) to ensure full employment equilibrium. Keynesian economics, emerging during the Great Depression, argues that prices and wages are ‘sticky’ downwards, leading to persistent involuntary unemployment driven by aggregate demand shortfalls.
Underlying Mathematical Formulas & Equations
Keynesian Aggregate Demand (AD) = C + I + G + (X – M). Classical Quantity Equation: M * V = P * Y.
Concrete Worked Numerical Example
In a recession, a Classical model predicts wages will fall until labor demand meets supply, restoring full employment. A Keynesian model assumes workers resist wage cuts (sticky wages). If investment (I) drops by $100 billion and the marginal propensity to consume is 0.8, the multiplier is 5, causing a $500 billion drop in GDP.
Real-World Empirical Application: Historical Case Study
The Great Depression discredited classical theory as high unemployment persisted for years. Keynesian deficit spending (New Deal, WWII mobilization) demonstrated how government intervention (G) could replace lost private demand (C + I).
Limitations, Criticisms, and Competing Schools of Thought
New Classical economists argue Keynesian policies ignore rational expectations and lead to stagflation, as seen in the 1970s. Supply-side economists argue excessive demand stimulus harms long-term growth.
Comprehensive FAQ Section
What are sticky wages?
The concept that nominal wages are slow to adjust downward during economic downturns due to contracts, minimum wages, and worker morale.
Academic References & Primary Source Citations
- Keynes, J. M. (1936). The General Theory of Employment, Interest and Money.
- Say, J. B. (1803). A Treatise on Political Economy.