Macroeconomic Equilibrium: Recessionary and Inflationary Gaps (Chapter 13 Study Notes)

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Chapter 13: Recessionary and Inflationary Gaps

Macroeconomic Equilibrium in the Long Run and the Short Run

This topic explores how the aggregate demand and aggregate supply (AD-AS) model is used to distinguish between short-run and long-run macroeconomic equilibrium. Understanding these concepts is essential for analyzing fluctuations in real GDP and the role of policy in stabilizing the economy.

Short-run equilibrium occurs where aggregate demand (AD) intersects short-run aggregate supply (SRAS).
Long-run equilibrium is achieved when real GDP equals potential GDP, represented by the intersection of AD, SRAS, and long-run aggregate supply (LRAS).
Potential GDP is the level of output the economy can produce at full employment.

Recessionary Gap

A recessionary gap arises when actual real GDP is less than potential GDP, indicating underutilization of resources and higher unemployment.

Definition: The gap between the level of real GDP produced and potential GDP, where real GDP is less than potential GDP.
Graphical Representation: On the AD-AS diagram, equilibrium occurs to the left of LRAS.
Implications: Indicates cyclical unemployment and downward pressure on prices.

How to Close a Recessionary Gap

Aggregate Demand Shifters: Increasing AD (shift right) raises output but also increases the price level.
Aggregate Supply Shifters (SRAS): Increasing SRAS (shift right) raises output and lowers prices.
Aggregate Supply Shifters (LRAS): Decreasing LRAS (shift left) lowers potential output, but this is generally undesirable.

Example: During a recession, government stimulus (fiscal policy) or lower interest rates (monetary policy) can shift AD right, closing the gap.

Inflationary Gap

An inflationary gap occurs when actual real GDP exceeds potential GDP, leading to upward pressure on prices and possible resource overuse.

Definition: The gap between the level of real GDP produced and potential GDP, where real GDP is greater than potential GDP.
Graphical Representation: On the AD-AS diagram, equilibrium occurs to the right of LRAS.
Implications: Indicates low unemployment and rising inflation.

How to Close an Inflationary Gap

Aggregate Demand Shifters: Decreasing AD (shift left) lowers output and reduces the price level.
Aggregate Supply Shifters (SRAS): Decreasing SRAS (shift left) raises prices further.
Aggregate Supply Shifters (LRAS): Increasing LRAS (shift right) raises potential output, reducing the gap.

Example: The central bank may raise interest rates to reduce AD and control inflation.

Public Policy Response

Governments and central banks use various policies to address output gaps and stabilize the economy.

No Intervention Policy: "Wait and see" approach, allowing the economy to self-adjust over time.
Stabilization Policy: Active intervention to return the economy to potential output.
- Expansionary Policy: Increases real GDP (used in recessionary gaps).
- Contractionary Policy: Decreases real GDP (used in inflationary gaps).

Types of Stabilization Policy

Fiscal Policy: Use of government spending, transfer payments, and taxes to influence aggregate demand.
Monetary Policy: Use of central bank actions (e.g., changing interest rates) to influence aggregate demand.

Example: During the 2008 financial crisis, both fiscal stimulus and monetary easing were used to close a recessionary gap.

Real GDP and Potential GDP Trends

Tracking real GDP and potential GDP over time helps identify periods of recessionary and inflationary gaps.

Trend Analysis: Real GDP fluctuates around potential GDP, with gaps indicating periods of economic instability.
Graphical Data: Economic data (e.g., FRED charts) show historical trends and the impact of policy interventions.

Inflationary and Recessionary Gap Trends

Gap trends over time reveal the cyclical nature of the economy and the effectiveness of policy responses.

Positive Gap: Indicates inflationary periods.
Negative Gap: Indicates recessionary periods.

The Short-Run and Long-Run Effects of an Increase in Aggregate Demand

Changes in aggregate demand can have different effects in the short run and long run.

Short-Run: An increase in AD raises output and lowers unemployment, but also increases the price level.
Long-Run: Higher prices lead to increased wage expectations, shifting SRAS left and restoring equilibrium at a higher price level.

Example: If firms invest more due to optimism, AD shifts right, reducing unemployment and raising prices. Over time, higher wages and costs shift SRAS left, returning output to potential GDP.

The Short-Run and Long-Run Effects of a Supply Shock

Supply shocks, such as sudden increases in oil prices, shift SRAS and can cause stagflation.

Definition: A supply shock is a sudden change in SRAS, often due to external factors.
Stagflation: A combination of inflation and recession resulting from a negative supply shock.
Short-Run: Output falls, unemployment rises, and prices increase.
Long-Run: Lower output and higher unemployment lead to lower wage and price expectations, shifting SRAS right and restoring equilibrium.

Example: The 1970s oil crisis caused stagflation in many economies.

Restoring Full Employment After a Supply Shock

Adjustment Time: Restoration depends on the severity of the shock and may take several years.
Policy Intervention: Fiscal or monetary policy can increase AD, but may result in permanently higher prices.

Key Terms and Formulas

Aggregate Demand (AD): Total demand for goods and services in the economy.
Short-Run Aggregate Supply (SRAS): Total supply of goods and services at different price levels in the short run.
Long-Run Aggregate Supply (LRAS): Total supply at full employment.
Potential GDP:
Recessionary Gap:
Inflationary Gap:

Summary Table: Policy Responses to Output Gaps

Gap Type	Policy Response	Expected Effect
Recessionary Gap	Expansionary Fiscal/Monetary Policy	Increase AD, raise output, reduce unemployment
Inflationary Gap	Contractionary Fiscal/Monetary Policy	Decrease AD, lower output, reduce inflation
Supply Shock	Wait for SRAS to adjust or use policy to increase AD	Restore equilibrium, may result in higher prices

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