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Class 12 Macro Economics Notes · CBSE

Deficient Demand

9.2 Deficient Demand — understand when aggregate demand falls short of aggregate supply at full employment, creating deflationary pressure. CBSE Class 12 Macroeconomics notes with diagrams and causes.

Last updated: 22 Aug 2026

Notes

Understanding Deficient Demand

Deficient demand refers to the situation when aggregate demand (AD) is less than the aggregate supply (AS) corresponding to the full employment level of output in the economy.

Deflationary Gap: The gap by which actual aggregate demand falls short of the aggregate demand required to establish full employment equilibrium. It is called deflationary because this leads to a fall in the general price level.

Deficient Demand and Deflationary Gap

EG
Key Insight: Due to a decrease in investment expenditure (ΔI), aggregate demand falls from AD to AD1. The gap between them (EG) is the deflationary gap. Point F indicates the underemployment equilibrium.
Important Note: During deficient demand, equilibrium is determined at a level less than full employment equilibrium. It leads to underemployment equilibrium with involuntary unemployment in the economy.

Causes of Deficient Demand

Deficient demand arises when any of the four components of aggregate demand (Consumption, Investment, Government Spending, Net Exports) decrease.

Impact of Deficient Demand

Effect on Output

Rising inventory stock forces firms to cut production. Planned output falls as aggregate demand is insufficient.

Effect on Employment

Deficient demand causes involuntary unemployment as firms reduce production and lay off workers.

Effect on Price Level

Deficient demand causes deflation — a sustained fall in the general price level as demand falls short of supply.

Deficient demand creates many difficulties in the economy due to its deflationary nature. It adversely affects the level of output, employment, and price level. During COVID-19 lockdowns, India experienced exactly this — demand collapsed, output fell, and millions lost jobs.

Key Takeaways

Key Takeaways

  • Deficient demand occurs when AD falls short of AS at the full employment level of output.
  • It creates a deflationary gap (EG), which leads to a fall in the general price level.
  • The main causes are decreased consumption, investment, government spending, exports, and increased imports.
  • Deficient demand reduces output, increases unemployment, and causes deflation.
  • During deficient demand, firms face rising inventories and are forced to cut production and lay off workers.
  • COVID-19 lockdowns (2020-21) are a real-world example — demand collapsed, factories shut down, and unemployment spiked across India.