Business Cycles and Real Business Cycle (RBC) Theory

Inflationary and Recessionary Gaps

Inflationary and recessionary gaps occur when actual output deviates from potential output in the economy. The market can close these gaps over time, often through adjustments in nominal wages.

• Inflationary gap: Actual GDP exceeds potential GDP, leading to upward pressure on prices and wages.

• Recessionary gap: Actual GDP is below potential GDP, resulting in unemployment and downward pressure on wages.

• Nominal wage adjustment: Inflationary gaps are closed by increasing nominal wages, while recessionary gaps are closed by decreasing nominal wages.

Additional info: Wage adjustments affect aggregate supply, shifting it left (inflationary gap) or right (recessionary gap).

Real Business Cycle (RBC) Theory

RBC theory explains economic fluctuations as responses to real (not monetary) shocks, such as changes in technology or productivity.

• Nominal wages: According to RBC theory, nominal wages will decrease to close inflationary gaps and remain unchanged in recessionary gaps due to wage stickiness.

• Recessions: RBC theory posits that recessions happen because nominal wages are sticky and do not adjust downward quickly.

Aggregate Supply, Aggregate Demand, and Wage-Price Spiral

Short-Run Aggregate Supply (SRAS) and Wage Bargaining

The wage-price spiral arises when increases in aggregate demand push up prices, leading workers to bargain for higher wages, which in turn increases costs and prices further.

• Aggregate demand: An increase in aggregate demand can lead to higher nominal wages and prices.

• Wage-price spiral: This process can perpetuate inflation if not checked by policy or market forces.

Example: If the government stimulates aggregate demand, prices rise, and workers demand higher wages, leading to further price increases.

Countercyclical Variables

Definition and Examples

Countercyclical variables move in the opposite direction of the business cycle.

• Unemployment rate: Rises during recessions, falls during expansions.

• Investment: Typically falls during recessions and rises during expansions.

• Consumption: Usually procyclical, moving with the business cycle.

GDP, Debt, and Interest Payments

GDP and Debt-to-GDP Ratio

Gross Domestic Product (GDP) measures the total value of goods and services produced in a country. The debt-to-GDP ratio compares a country's public debt to its GDP, indicating fiscal health.

• Debt-to-GDP ratio: An increase suggests rising debt relative to economic output.

• Interest payments: The cost of servicing public debt, often expressed as a percentage of GDP.

Example: If France's GDP is 1 trillion Euros and public debt is 800 billion Euros, the debt-to-GDP ratio is 80%.

Fiscal Policy: Budget Surplus and Deficit

Definitions

• Budget surplus: When government revenues exceed expenditures.

• Budget deficit: When government expenditures exceed revenues.

• Structural deficit: The portion of the deficit that remains even when the economy is at full employment.

Example: If potential GDP is $25 trillion and actual GDP is $24 trillion, a budget deficit of $2 trillion is structural.

Fiscal and Monetary Policy

Fiscal Policy

Fiscal policy involves government decisions on taxation and spending to influence the economy.

• Taxation: Used to fund government spending and influence aggregate demand.

• Government spending: Directly affects aggregate demand and economic activity.

Monetary Policy

Monetary policy is managed by the central bank to control money supply, interest rates, and inflation.

• Tools: Open market operations, reserve requirements, discount rate.

• Inflationary gap response: The central bank may increase nominal interest rates or decrease the nominal interest rate to address inflationary or recessionary gaps, respectively.

• Expansionary policy: Lowering interest rates, reducing reserve requirements, or purchasing government bonds to increase money supply.

Money Supply and Money Multiplier

Definitions and Calculations

The money supply is the total amount of monetary assets available in an economy at a specific time. The money multiplier shows how much the money supply increases for each dollar of reserves.

• Monetary base: The sum of currency in circulation and reserves held by banks.

• Money supply: Includes currency, demand deposits, and other liquid assets.

• Money multiplier formula:

Example: If the reserve ratio is 0.5, the money multiplier is .

Money Creation Process

Banks create money through lending. When the central bank buys bonds, it increases reserves, allowing banks to lend more and expand the money supply.

• Step 1: Central bank buys bonds, increasing reserves.

• Step 2: Banks lend out a portion of deposits, keeping some as reserves.

• Step 3: Borrowers deposit funds in other banks, which then lend further.

Example Table: Money Creation

Additional info: The total money supply created is the sum of all deposits and loans.

Money Velocity

Definition

The velocity of money refers to the rate at which money circulates in the economy, or how often a unit of currency is used to purchase goods and services within a given period.

• Formula:

Where is velocity, is price level, is real output, and is money supply.

Summary Table: Key Macroeconomic Concepts