Chapter 12: The Business Cycle, Inflation, and Deflation Study Notes

After studying this chapter, you will be able to:
- Explain how aggregate demand shocks and aggregate supply shocks create the business cycle.
- Explain how demand-pull and cost-push forces bring cycles in inflation and output.
- Explain the causes and consequences of deflation.
- Explain how the short-run and long-run tradeoff between inflation and unemployment.

The business cycle is characterized as easy to describe but hard to explain.
Two frameworks for understanding the business cycle:
- Mainstream Business Cycle Theory:
- Real GDP fluctuates around potential GDP due to the steady growth of potential GDP and the fluctuating growth of aggregate demand.
- Real Business Cycle Theory:
- Additional approaches not specified in the transcript but indicate an alternative understanding of business cycles.

Initial Conditions and Growth
- At the beginning of the cycle, potential GDP is at $1.4 trillion, indicating full employment at point A.
- Potential GDP increases to $2.0 trillion, causing the Long-Run Aggregate Supply (LAS) curve to shift rightward.
Impact of an Economic Expansion
- During an expansion period, aggregate demand (AD) tends to increase more than potential GDP, representing a rightward shift in the AD curve to AD1.
- This shift causes the price level to rise to 110, based on expectations set during the initial period.
- With the wage rate set in anticipation of this inflation, the Short-Run Aggregate Supply (SAS) curve shifts to the left, reflecting changes in input costs due to higher wages.

When aggregate demand grows at a fluctuating rate, these shifts cause:
- Point C: If AD grows more slowly than potential GDP, real GDP growth is slower, leading to lower inflation than expected.
- Point D: In contrast, if AD increases faster than potential GDP, a faster growth in real GDP occurs with higher inflation than expected.
Economic behavior revolves around these relationships, driven mainly by changes in potential GDP and AD fluctuations.

Inflation is defined as the persistent increase in price levels over time.
Long-Run Phenomenon:
- Inflation occurs when the quantity of money grows faster than potential GDP.
Short-Run Influences:
- Various factors can trigger inflation, influencing real GDP and prices simultaneously.

Demand-Pull Inflation:
- Initiated by an increase in aggregate demand.
- Factors leading to demand-pull inflation include:
  - Cuts in interest rates.
  - Increases in money quantity.
  - Increases in government spending or exports.
  - Investments spurred by high expected future profits.
- Resulting process involves a rightward shift in the AD curve.
- As AD increases, the price level rises, leading to an inflationary gap.
- Steps of Transition in Demand-Pull Inflation:
- The initial increase in aggregate demand raises the price level and real GDP.
- The wage rate reacts by increasing, subsequently shifting the SAS leftward again, leading to a further price increase.
- The cycle may continue, reinforcing the demand-pull dynamic.
Cost-Push Inflation:
- Initiated by rising production costs, such as wages or raw materials.
- Examples include scenarios where oil prices rise, affecting costs across many sectors.
- Results in a leftward shift in the SAS curve, causing higher prices and lower real GDP.
- Potential Bank of Canada intervention through demand stimulation.

Demand-Pull Cycle:
- Characterized by ongoing increases in aggregate demand, which sustains inflation over time.
- Historical context: Canada saw significant demand-pull inflation in the 1970s.
Cost-Push Dynamics:
- A single increase in cost can lead to temporary price rises but not sustained inflation without a corresponding increase in aggregate demand.
- Corresponding Bank of Canada policies may aim to counter the impact of reduced real GDP by increasing money supply, hence engaging inflationary processes.
- Resulting economic phenomena include stagflation, witnessed historically in the 1970s due to oil price hikes.

If inflation increases align with expectations, wages climb, sustaining potential GDP and labor market balance.
Conversely, discrepancies in inflation forecasts may either inflate or depress GDP responses, leading to cyclical economic behavior.

Definition: An economy experiences deflation when there is a persistently falling price level.
Key questions addressed in the study of deflation include:
- Causes of deflation.
- Consequences of deflation.
- Strategies for overcoming deflation.

Persistent price reductions occur when aggregate demand grows at a slower rate than aggregate supply.
Quantity Theory and Deflation:
- The formula for understanding inflation rates is:
  $\text{Inflation Rate} = \text{Money Growth Rate} + \text{Rate of Velocity Change} - \text{Real GDP Growth Rate}$
- Deflation arises when:
  $\text{Money Growth Rate} < \text{Real GDP Growth Rate} + \text{Rate of Velocity Change}$
Japan serves as an example of deflation with a real GDP growth rate of 0.8%, a money growth rate of 2.5%, and a velocity change of -3%, resulting in a deflation rate of 1.3% annually.

Unanticipated deflation restructures both income and wealth allocation, lowering real GDP and overall employment rates while diverting production resources away from core activities.
Solutions to combat deflation include:
- Increasing the growth rate of money supply to ensure it exceeds the combined growth rate of real GDP and velocity changes.

The Phillips Curve illustrates the relationship between inflation and unemployment rates.
Comprises two distinct time frames:
- Short-Run Phillips Curve:
- Depicts the trade-off between inflation and unemployment, holding expected inflation and natural unemployment rate constant.
- Long-Run Phillips Curve:
- Indicates the relationship when actual inflation equates with expected inflation, demonstrating a vertical orientation at the natural unemployment rate.

Short-Run Phillips Curve (SRPC):
- Illustrated as a downward-sloping curve reflecting the interplay of inflation versus unemployment.
- Relationships in SRPC:
  - If inflation exceeds expectations, unemployment declines.
  - Conversely, if inflation falls short of expectations, unemployment rises.
Long-Run Phillips Curve (LRPC):
- Establishes a vertical alignment at the natural unemployment rate, underlying a key relationship between expectations and economic equilibrium.
- Shifts in expected inflation result in shifts in the SRPC.
Influences on Unemployment Rates:
- Changes in the natural unemployment rate affect both the long-run and short-run Phillips curves, indicative of structural changes in the economy.

The dynamics of the business cycle, along with inflation and deflation, are intricately linked through the behaviors of aggregate demand and supply, affected by both policy responses and expectations within the market.