Holding wealth as money — cash in your wallet, a balance in a no-interest checking account — is convenient but costly: every dollar held as money is a dollar not earning interest in a bond or savings instrument. The nominal interest rate is the opportunity cost of holding money.
That's why the money demand (MD) curve slopes downward against the nominal interest rate: when rates are high, parking $10,000 in checking instead of a 6%-yield bond fund costs $600 a year, so people economize on money holdings; when rates are low, the convenience is nearly free and people hold more.
What shifts MD (the rate itself only moves you along the curve):
| Shifter | Direction | Logic |
|---|---|---|
| Price level rises | MD right | Every transaction needs more dollars — same groceries, higher bill |
| Real GDP rises | MD right | More transactions happening — more income, more buying |
| Price level or real GDP falls | MD left | Fewer/cheaper transactions need fewer dollars |
The central bank chooses the quantity of money; that quantity does not respond to the interest rate. So the money supply (MS) curve is vertical at whatever quantity the central bank sets. The Fed can move the line — that's monetary policy, next lesson — but the market rate cannot.
The nominal interest rate settles where MD crosses MS.
[GRAPH: The money market
X-axis: Quantity of money
Y-axis: Nominal interest rate (i)
Curve 1: MD, downward-sloping
Curve 2: MS, vertical at the quantity the central bank sets
Equilibrium at (Q1, i1), both dashed to the axes]
Shift logic — four cases to make automatic:
[GRAPH: Money supply increase
MS1 shifts right to MS2; equilibrium moves from (Q1, i1) to (Q2, i2)
with i2 < i1 — the nominal interest rate falls]
When both MD shifters move the same way — an expansion raising both real GDP and the price level — MD shifts right twice over, and with MS fixed the nominal rate unambiguously rises.
The choice modeled here is money vs. interest-bearing assets, and the yield you sacrifice by holding money is the stated (nominal) rate on those assets. Both money and bonds lose purchasing power to inflation equally, so inflation doesn't change the relative cost of holding money — the nominal rate captures the entire trade-off. Label the money market's vertical axis "nominal interest rate." (The loanable funds market, covered later, uses the real rate, because savers and borrowers there care about purchasing power over years. Mixing up the two axis labels is one of the most common errors on the CLEP exam.)
1. A. Every dollar held as money forgoes the interest an alternative asset would pay; the higher that forgone rate, the less money people choose to hold — hence the downward slope. B: the central bank sets the money quantity; the rate emerges from the market. C: the nominal rate includes expected inflation but isn't equal to it. D: the price level shifts MD; it doesn't define the rate. E: the model's point is that money earns (roughly) nothing — that's what creates the cost.
Fix: MD slopes down because the nominal interest rate is money's price tag — the interest you give up to hold it.
2. B. The quantity of money is a policy choice, not a market response: whatever the interest rate, the quantity stays where the central bank put it — a vertical line. A: MD's slope is a separate matter (and MD does depend on the rate). C: banks lend constantly; that's Lesson 8. D: no law fixes the rate — the market sets it where MD crosses MS. E: velocity belongs to the quantity theory, not to this graph's shape.
Fix: Vertical MS = policy-chosen quantity; only the central bank moves the line.
3. C. More money supplied at every rate shifts the vertical MS line rightward; at the old rate people hold more money than they want, and the rate falls along MD to the new intersection. A/D: the policy changed supply, not demand. B: an increase moves MS right, not left. E: vertical means the quantity doesn't respond to the rate — the line itself certainly moves when policy changes.
Fix: Central bank actions move the vertical MS line; read the new rate off the MD curve.
4. E. A higher price level means every purchase needs more dollars — groceries, rent, gas — so money demand shifts right, and against a fixed MS the nominal rate rises. A: direction reversed. B/C: the money supply moves only when the central bank acts. D: the price level is not on this graph's axes, so it shifts MD rather than moving along it.
Fix: MD shifts with the price level and real GDP; only the interest rate moves you along the curve.
5. B. Less income means fewer and smaller transactions, so less money is needed at every rate: MD shifts left and the rate falls along the fixed MS. A: that's the expansion case, reversed. C: no policy action occurred. D: with MS fixed, the rate can't rise unless MD rises. E: no mechanism makes MS horizontal — it stays vertical.
Fix: Real GDP down → MD left → nominal rate down; real GDP up → MD right → rate up.
6. E. A smaller money supply shifts the vertical MS line left; the same money demand now intersects it at a higher nominal rate. A: more money lowers the rate. B: a lower price level shifts MD left — rate falls. C: lower real GDP also shifts MD left — rate falls. D: holding less money at every rate is a leftward MD shift — rate falls.
Fix: Rate rises when money gets scarcer (MS left) or more sought-after (MD right); every other combination lowers it.
7. C. The choice being modeled is money vs. bonds, and what you sacrifice by holding money is the bond's stated yield — a nominal figure. Inflation erodes money and bonds alike, so it drops out of the comparison. A: the real rate exists; it just lives in the loanable funds market. B: no zero-inflation assumption is needed — that's the point. D: central banks steer nominal instruments directly. E: money demand depends on real GDP too, and that isn't the reason for the axis label.
Fix: Money market = nominal rate (the stated yield forgone); loanable funds = real rate. Label the axis accordingly.
8. B. Higher real GDP and a higher price level each shift MD right; together the shift is unambiguous, and against a vertical MS the nominal rate must rise. A: saving behavior is a loanable-funds story, not a money market shifter. C: the two forces push the same way — nothing offsets. D: a higher price level raises money demand. E: nothing here drives rates below zero.
Fix: PL up and real GDP up are teammates, not rivals — both push MD right and the nominal rate up.
9. D. MS shifts left: the vertical line stands at a smaller quantity, and it now crosses MD higher up — a higher nominal rate. A/B: a lower rate follows an MS increase, not a decrease. C: a contraction can't leave more money in the market. E: with a downward-sloping MD, a smaller quantity must clear at a higher rate — the rate cannot stay put.
Fix: MS left = scarcer money = higher nominal rate, smaller quantity; read both coordinates off the new intersection.
10. D. Opportunity cost = forgone yield: 6% × $10,000 = $600 per year. A: checking balances being money is exactly why holding them has an opportunity cost — the forgone interest. B: $60 uses 0.6%, a decimal slip. C: $100 uses 1%. E: $6,000 uses 60%.
Fix: Cost of holding money = interest rate × amount held; convert the percent carefully.
11. A. The interest rate is on the money market's vertical axis, so a rate change produces movement along MD. Shifts require a change in something not on the axes: the price level or real GDP. B: the rate can never shift the curve it's plotted against. C: only non-axis variables shift a curve. D: MD shifts routinely — just not for this reason. E: MS is a policy choice; market rates don't move it either.
Fix: Axis variable = movement along the curve; off-axis variable (PL, real GDP) = shift. Check the axes before calling anything a shift.
12. C. More expensive transactions require more dollars in hand, so a higher price level shifts MD right — and with MS fixed, the nominal rate rises, the opposite of the prediction. A: higher prices raise, not reduce, money demand. B: the money supply moves only by central bank action. D: the price level is one of MD's two main shifters — deeply connected. E: the market, not the government, sets the equilibrium rate in this model.
Fix: Higher price level → MD right → nominal rate up (MS fixed). "Less to spend" confuses purchasing power with the demand for dollars.
1. A. Every dollar held as money forgoes the interest an alternative asset would pay; the higher that forgone rate, the less money people choose to hold — hence the downward slope. B: the central bank sets the money quantity; the rate emerges from the market. C: the nominal rate includes expected inflation but isn't equal to it. D: the price level shifts MD; it doesn't define the rate. E: the model's point is that money earns (roughly) nothing — that's what creates the cost. Fix: MD slopes down because the nominal interest rate is money's price tag — the interest you give up to hold it.
2. B. The quantity of money is a policy choice, not a market response: whatever the interest rate, the quantity stays where the central bank put it — a vertical line. A: MD's slope is a separate matter (and MD does depend on the rate). C: banks lend constantly; that's Lesson 8. D: no law fixes the rate — the market sets it where MD crosses MS. E: velocity belongs to the quantity theory, not to this graph's shape. Fix: Vertical MS = policy-chosen quantity; only the central bank moves the line.
3. C. More money supplied at every rate shifts the vertical MS line rightward; at the old rate people hold more money than they want, and the rate falls along MD to the new intersection. A/D: the policy changed supply, not demand. B: an increase moves MS right, not left. E: vertical means the quantity doesn't respond to the rate — the line itself certainly moves when policy changes. Fix: Central bank actions move the vertical MS line; read the new rate off the MD curve.
4. E. A higher price level means every purchase needs more dollars — groceries, rent, gas — so money demand shifts right, and against a fixed MS the nominal rate rises. A: direction reversed. B/C: the money supply moves only when the central bank acts. D: the price level is not on this graph's axes, so it shifts MD rather than moving along it. Fix: MD shifts with the price level and real GDP; only the interest rate moves you along the curve.
5. B. Less income means fewer and smaller transactions, so less money is needed at every rate: MD shifts left and the rate falls along the fixed MS. A: that's the expansion case, reversed. C: no policy action occurred. D: with MS fixed, the rate can't rise unless MD rises. E: no mechanism makes MS horizontal — it stays vertical. Fix: Real GDP down → MD left → nominal rate down; real GDP up → MD right → rate up.
6. E. A smaller money supply shifts the vertical MS line left; the same money demand now intersects it at a higher nominal rate. A: more money lowers the rate. B: a lower price level shifts MD left — rate falls. C: lower real GDP also shifts MD left — rate falls. D: holding less money at every rate is a leftward MD shift — rate falls. Fix: Rate rises when money gets scarcer (MS left) or more sought-after (MD right); every other combination lowers it.
7. C. The choice being modeled is money vs. bonds, and what you sacrifice by holding money is the bond's stated yield — a nominal figure. Inflation erodes money and bonds alike, so it drops out of the comparison. A: the real rate exists; it just lives in the loanable funds market. B: no zero-inflation assumption is needed — that's the point. D: central banks steer nominal instruments directly. E: money demand depends on real GDP too, and that isn't the reason for the axis label. Fix: Money market = nominal rate (the stated yield forgone); loanable funds = real rate. Label the axis accordingly.
8. B. Higher real GDP and a higher price level each shift MD right; together the shift is unambiguous, and against a vertical MS the nominal rate must rise. A: saving behavior is a loanable-funds story, not a money market shifter. C: the two forces push the same way — nothing offsets. D: a higher price level raises money demand. E: nothing here drives rates below zero. Fix: PL up and real GDP up are teammates, not rivals — both push MD right and the nominal rate up.
9. D. MS shifts left: the vertical line stands at a smaller quantity, and it now crosses MD higher up — a higher nominal rate. A/B: a lower rate follows an MS increase, not a decrease. C: a contraction can't leave more money in the market. E: with a downward-sloping MD, a smaller quantity must clear at a higher rate — the rate cannot stay put. Fix: MS left = scarcer money = higher nominal rate, smaller quantity; read both coordinates off the new intersection.
10. D. Opportunity cost = forgone yield: 6% × $10,000 = $600 per year. A: checking balances being money is exactly why holding them has an opportunity cost — the forgone interest. B: $60 uses 0.6%, a decimal slip. C: $100 uses 1%. E: $6,000 uses 60%. Fix: Cost of holding money = interest rate × amount held; convert the percent carefully.
11. A. The interest rate is on the money market's vertical axis, so a rate change produces movement along MD. Shifts require a change in something not on the axes: the price level or real GDP. B: the rate can never shift the curve it's plotted against. C: only non-axis variables shift a curve. D: MD shifts routinely — just not for this reason. E: MS is a policy choice; market rates don't move it either. Fix: Axis variable = movement along the curve; off-axis variable (PL, real GDP) = shift. Check the axes before calling anything a shift.
12. C. More expensive transactions require more dollars in hand, so a higher price level shifts MD right — and with MS fixed, the nominal rate rises, the opposite of the prediction. A: higher prices raise, not reduce, money demand. B: the money supply moves only by central bank action. D: the price level is one of MD's two main shifters — deeply connected. E: the market, not the government, sets the equilibrium rate in this model. Fix: Higher price level → MD right → nominal rate up (MS fixed). "Less to spend" confuses purchasing power with the demand for dollars.