AP Macroeconomics · Unit 4 · Topic 4.1

Financial Assets Study Lab

People store wealth in financial assets such as cash, bank deposits, bonds, and stocks, and each one trades off liquidity, rate of return, and risk. Move the interest rate to see why bond prices and interest rates always move in opposite directions. Then compare the four assets side by side.

1. The bond seesaw

You own an existing bond with a $1,000 face value that pays a fixed $50 a year (a 5% coupon). When it was issued, the market interest rate was 5%. Change the market interest rate and watch what a buyer will pay for your bond.

The seesaw interest rate vs. bond price

Price of the existing bond at each market interest rate

Market interest rateBond priceFace value ($1,000)Starting point (5%, $1,000)
Try a scenario
Your bond's $50 coupon never changes
Time until your bond repays $1,000
Market interest rate
5.0%
Price of your bond
$1,000
Change from $1,000
0
Interest lost holding $1,000 cash
$50 / yr
Enrichment: beyond the core AP framework

Where the price comes from (present value)

A buyer pays today for money that arrives later. Each future payment is worth less today, because money today could earn the market interest rate. The price of the bond is the present value of everything it will pay. You do not need this math on the AP exam; the inverse relationship is what matters.

Compare the assets

Pick an asset. Bars show a rough ranking from low to high on each trait. The pattern to remember: the more liquid and safe an asset is, the lower the rate of return it usually pays.

Liquidity, return, and risk rough ranking, not real data

LiquidityRate of returnRisk

2. Key ideas

Definition

Financial assets

A financial asset is a claim on future income or value. Cash, checking deposits, bonds, and stocks are all financial assets. Households hold them to store wealth.

Trait 1

Liquidity

Liquidity is how easily and quickly an asset can be turned into cash without losing value. Cash is the most liquid asset. Checking deposits are close behind. Stocks and bonds take a sale and their price may have changed.

Trait 2

Rate of return

The rate of return is the gain from holding an asset, as a percent of what you paid. Cash earns nothing. Bonds pay interest. Stocks can pay dividends and can rise in price.

Trait 3

Risk

Risk is the chance that the actual return differs from what you expected, including losing money. Buyers demand a higher expected return before they will hold a riskier asset.

Inverse relationship

Bond prices and interest rates

An existing bond pays a fixed amount. When market interest rates rise, new bonds pay more, so the old bond's price must fall until a buyer earns the market rate. When rates fall, the old bond's price rises.

Opportunity cost

Holding money

Money in your pocket earns no interest. The interest you give up by holding money instead of a bond is the opportunity cost of holding money, measured by the nominal interest rate. A higher nominal rate means people hold less money.

3. Bond and interest rate cheat sheet

Each row is a chain you can write on an FRQ. Bond prices and interest rates always move in opposite directions.

EventPrice of existing bondsInterest rateOpportunity cost of holding moneyQuantity of money demanded
Market interest rates rise↓ Falls↑↑↓
Market interest rates fall↑ Rises↓↓↑
Central bank buys bonds (open market purchase)↑ Rises (more demand for bonds)↓↓↑
Central bank sells bonds (open market sale)↓ Falls (more supply of bonds)↑↑↓
Savers want more bonds (demand for bonds rises)↑ Rises↓↓No change (MS fixed)
Government or firms issue more bonds↓ Falls↑↑No change (MS fixed)
AssetLiquidityRate of returnRisk
CashHighestNone (0%)Very low; inflation lowers its purchasing power
Checking depositsVery highVery lowVery low (deposits are insured)
BondsMediumMedium (interest)Medium: default risk and price risk when rates rise
StocksMedium to lowerHighest expectedHighest: prices and dividends can fall

4. Writing it on the FRQ

Answers that earn points

  • State the direction and the reason: "Interest rates rise, so the price of previously issued bonds falls, because new bonds pay a higher rate."
  • For open market operations, link all three: the central bank buys bonds, bond prices rise, interest rates fall. Selling bonds does the reverse.
  • When a question gives a bond's fixed annual payment, show the work. For a bond that pays a fixed amount forever (no maturity date), price = annual payment ÷ market interest rate: $50 ÷ 0.10 = $500. For bonds that mature, AP only asks for the direction: the price falls.
  • For the opportunity cost of holding money, name the nominal interest rate. A higher nominal rate raises the opportunity cost and lowers the quantity of money demanded.
  • On a money market graph, label the vertical axis Nominal interest rate and show a change in the interest rate as a movement along MD.
  • When comparing assets, use the words liquidity, rate of return, and risk, and state the trade-off: more liquid assets usually earn a lower return.

Common mistakes

  • Saying bond prices rise when interest rates rise. They move in opposite directions.
  • Thinking the bond's coupon payment changes. The payment is fixed when the bond is issued. Only the price changes.
  • Mixing up liquidity and return. Cash is the most liquid asset and earns the lowest return.
  • Calling a stock a loan. A stock is ownership in a firm. A bond is a loan to a government or firm.
  • Saying a higher interest rate shifts money demand left. A change in the nominal interest rate causes a movement along MD, a change in the quantity of money demanded.
  • Using the real interest rate for the opportunity cost of holding money. Use the nominal rate.

5. Practice questions

AP-style multiple choice. Pick an answer to see the explanation.

0 / 0 correct

6. Key terms

The vocabulary for topic 4.1. Read the list, flip through flashcards, or quiz yourself. For every term in the unit, see the Unit 4 terminology guide.