AP Macroeconomics Unit 4: Financial Sector Notes

Introduction

The financial sector channels saving toward borrowing and investment, creates transaction deposits through lending, and transmits monetary policy through interest rates and aggregate demand.

A bond is debt, a stock is ownership, and money is the most liquid transaction asset. Interest rates connect present and future value, while inflation determines how much purchasing power a nominal return actually delivers.

Banks create deposits when they lend, but every claim must remain on a balanced ledger. The AP money market uses a nominal interest rate and nominal money balances; the loanable-funds market uses a real rate and saving per period. Keeping those axes distinct prevents most unit errors.

Future payment and discount rate

asset price

Nominal rate and inflation

real return

Bank loan and matching deposit

money creation

Money supply and money demand

nominal interest rate

Saving and investment demand

real interest rate

Current exam guidance: Aligned to the current 2026–27 AP Macroeconomics framework. Models identify their axes, assumptions, time horizon, movement or shift, and quantitative consequence.

4.1

Financial Assets

How do money, bonds, and stocks differ, and why do fixed-payment bond prices move opposite market interest rates?

Short answer

Money provides liquidity, bonds promise debt payments, and stocks represent residual ownership; a higher market discount rate lowers the present value of a fixed future payment.

Know firstStocks and flows · Percent change · Present and future value

Identify the claim before comparing its return

Money is valued chiefly for liquidity: it can settle transactions quickly and predictably. A bond is a debt claim that promises specified payments and may have a maturity date. A stock is an ownership claim whose payoff depends on the firm after contractual obligations are met. Liquidity risk, default risk, inflation risk, and price risk describe different ways an asset can disappoint its holder.

A fixed future bond payment is worth less today when the market interest rate rises because a buyer can earn a higher return elsewhere. For a one-year payment of 110, present value is $110/(1+i)$ . It equals 100 at 10 percent but only about 91.67 at 20 percent. Buying an already-issued security transfers an asset; it is not itself the production of new capital counted as GDP investment.

Economic model

A higher discount rate lowers a fixed-payment bond price

Connect market yield changes to the present value of one promised future payment.

Held constant: One certain payment arrives in one year; taxes, default risk, coupons, and transaction costs are omitted.
Time horizon: One-year present-value comparison.
Read the change: Changing the market rate moves along this price relation; changing the promised payment or risk would create a different relation.

Future payment: 110

Price of a 110 payment

Horizontal axis: Market interest rate
Vertical axis: Present bond price

110%, 100220%, 91.67

same payment, heavier discount

P=\frac{F}{1+i}

The price of a fixed 110 payment falls from 100 at a ten percent rate to about 91.67 at a twenty percent rate.

Read the model as a table

A higher discount rate lowers a fixed-payment bond price values
Market rate	Future payment	Present price
0%	110	110
10%	110	100
20%	110	91.67
30%	110	84.62

A dense crowd of depositors gathered outside the American Union Bank during a bank run. — Liquidity depends on confidence and timing
Depositors value a bank claim partly because it can be converted into spendable funds. When many people demand conversion at once, a maturity mismatch can create a liquidity crisis even though the bank holds longer-term assets.
Use this visual to see
Connect liquidity, risk, and maturity to the behavior of financial-asset holders during a bank run.
What it cannot show
The crowd does not reveal the bank’s balance sheet, solvency, reserve position, deposit insurance, or the cause of the run.

Classify the asset before judging it

Asset	Claim	Typical strength	Central risk
money	transaction balance	liquidity	loss of purchasing power
bond	contractual debt payments	scheduled cash flow	default, inflation, and rate risk
stock	residual ownership	participation in firm value	uncertain payoff and price

Compare financial claims

Identify debt, ownership, or transaction balance.
Name promised versus residual payments.
Compare liquidity, maturity, and distinct risks.
Discount fixed future payments at the current market rate.
Separate trading an existing asset from financing new real investment.

Keep these three ideas

Money, bonds, and stocks create different claims.
Fixed-payment bond prices and market interest rates move inversely.
Trading a security is not automatically GDP investment.

Financial Sector