Monetary policy tools | Financial sector | AP Macroeconomics | Khan Academy

Understanding Monetary Policy

Introduction to Monetary Policy

• Monetary policy is a tool used by Central Banks to influence the economy, contrasting with Fiscal Policy, which involves government taxation and spending decisions.

Money Market Model Overview

• The money market model features the quantity of money on the horizontal axis (M1: cash in circulation and checkable deposits) and nominal interest rates on the vertical axis.

• A perfectly inelastic money supply is assumed for simplicity, represented by a vertical line in the model. The demand curve for money indicates that higher nominal interest rates lead to lower demand for cash due to high opportunity costs.

Equilibrium Interest Rate Dynamics

• The intersection of supply and demand curves determines the equilibrium nominal interest rate. In a recessionary context, lowering nominal interest rates could stimulate borrowing and investment, helping close output gaps.

Tools for Increasing Money Supply

• To lower interest rates, Central Banks can increase the money supply through various tools; one primary method is Open Market Operations where bonds are bought from the market. This action introduces new cash into circulation rather than redistributing existing funds.

Mechanism of Open Market Operations

• When a Central Bank buys bonds (e.g., U.S. Government bonds), it injects new currency into the economy—often digital rather than physical cash—affecting monetary base levels significantly. This process utilizes a money multiplier effect based on reserve requirements set by banks.

Impact of Money Multiplier

• For example, if a bond worth $1,000 is purchased with a reserve requirement of 12.5%, this results in an effective increase in money supply by $8,000 due to the multiplier effect (1/0.125 = 8). Such actions can have substantial impacts when scaled up (e.g., $100 billion leading to an $800 billion increase).

Effects on Interest Rates

Adjusting Interest Rates During Economic Conditions

• Following an increase in money supply through bond purchases, equilibrium nominal interest rates decrease (R2), encouraging more borrowing and consumption aimed at closing negative output gaps during recessions.

Cooling Down Overheated Economies

• Conversely, if facing inflationary pressures or positive output gaps, Central Banks may opt to sell bonds instead of buying them; this removes cash from circulation and raises interest rates to slow down economic activity effectively.

Monetary Policy Tools and Their Effects

Shifting the Money Supply

• The money supply can be shifted left or right, affecting interest rates. This is often achieved through Open Market Operations.

• Changing the reserve requirement impacts the money multiplier; lowering it from 12.5% to 10% increases the multiplier from 8 to 10, thus increasing the money supply.

Discount Rate and Its Role

• The discount window at the Federal Reserve serves as a safety mechanism for banks needing reserves rather than a primary tool for monetary policy.

• The Federal Reserve sets a discount rate that is primarily operational during emergencies when banks need to borrow directly.

Federal Funds Rate Targeting

• The Federal Reserve targets the Federal Funds rate, which is the rate at which banks lend reserves overnight, using Open Market Operations to achieve this target.

Lag in Monetary Policy Effects

• There is often a lag in recognizing economic conditions (inflation or recession), which affects how quickly monetary policy can be enacted.

• Even after implementing monetary policy changes, there may be additional time required for these actions to fully impact the economy.