The money market determines the nominal interest rate in the short run. Two curves set it:
Where MD crosses MS sets the nominal rate. Push MS right and the rate falls; pull MS left and the rate rises.
The CLEP exam tests the traditional toolbox. Learn the direction of each:
| Tool | Expansionary (fight recession) | Contractionary (fight inflation) |
|---|---|---|
| Open market operations (the main tool) | Buy government bonds → reserves rise → money supply rises | Sell government bonds → reserves fall → money supply falls |
| Discount rate (the rate the central bank charges banks for short-term loans) | Lower it | Raise it |
| Reserve requirement | Lower it (rarely changed) | Raise it (rarely changed) |
Memory hook: buy = bigger money supply, sell = smaller. Open market operations work through the money multiplier from the banking lesson — reserves the central bank injects multiply into new deposits and loans.
Modern note: Since banks today hold abundant reserves, the central bank increasingly steers rates by adjusting the interest it pays banks on their reserve balances rather than by small bond sales. The CLEP exam tests the classic tools above, so master those first; the administered-rate approach is background context.
Expansionary: central bank buys bonds → money supply rises → nominal interest rate falls → investment (and interest-sensitive consumer borrowing, such as mortgages and auto loans) rises → aggregate demand shifts right → real GDP rises, price level rises, unemployment falls.
Contractionary: sell bonds → money supply falls → interest rate rises → investment falls → aggregate demand shifts left → real GDP falls toward potential, price level falls.
Every link matters. Skipping from "buy bonds" straight to "GDP rises" loses the logic the exam wants you to demonstrate.
When the central bank injects reserves, the maximum change in the money supply is the injection times the money multiplier (1 ÷ reserve requirement). For example, buying \$10 million of bonds at a 10% reserve requirement can expand the money supply by up to 10 × \$10 million = \$100 million.
In the short run, moving the money supply moves real output — the economy responds. In the long run, money is neutral: an increase in the money supply at full employment raises the price level and returns output to potential. More money cannot permanently raise real GDP.
Monetary policy faces lags (it takes months to work) and can be blunted when businesses and households refuse to borrow despite low rates — for instance, during a deep recession when firms are pessimistic about future sales. Low rates cannot force anyone to invest.
[GRAPH: The money market — expansionary policy
X-axis: Quantity of money
Y-axis: Nominal interest rate
Curve 1: Money demand, downward-sloping
Curve 2: Money supply, vertical at Q1
Initial equilibrium at (Q1, i1)
Shift: central bank buys bonds → money supply shifts right to a new
vertical line at Q2 → new equilibrium (Q2, i2 < i1) → nominal rate falls]
1. B. The central bank chooses the money stock, and that quantity does not change when the interest rate changes, so the supply curve is vertical. A: money demand does shift, but its behavior is a separate curve. C: quantity supplied is fixed by policy, not raised by higher rates. D: banks create deposits, but the central bank controls the monetary base. E: velocity belongs to the quantity theory, not to the shape of money supply.
Fix: A vertical money supply means "quantity set by policy, unresponsive to the rate."
2. D. A recession calls for expansion, and the expansionary open market operation is buying bonds, which injects reserves. A, B, C: all contractionary directions. E: cutting government spending is fiscal policy and is contractionary besides.
Fix: Recession → buy bonds; confirm you picked a central-bank tool, not a fiscal one.
3. C. A bond purchase adds reserves, shifting the vertical money supply right, so the rate falls along money demand. A: demand did not move. B: money supply stays vertical wherever it sits. D: demand is unchanged. E: the reserve injection is immediate, not delayed.
Fix: Open market operations move the money supply line; read the new rate off money demand.
4. A. The four-link chain runs money up, rate down, investment up, aggregate demand right, output up. B: describes contraction. C: the rate direction is wrong and saving is not the channel. D and E: these are fiscal chains (taxes, government spending), not monetary.
Fix: Monetary transmission is money supply → interest rate → investment → aggregate demand → GDP; fiscal tools are a different institution.
5. C. Selling securities drains reserves, shrinking the money supply and raising rates — the contractionary move. A and D: those ease policy. B: buying expands. E: transfers are fiscal and expansionary.
Fix: To fight inflation with a classic tool, sell bonds ("sell = smaller money supply").
6. D. The money multiplier is 1 ÷ 0.10 = 10, so the maximum increase is 10 × \$10 million = \$100 million. A: that is the injection itself, not the multiplied total. B: divides instead of multiplying. C: uses a multiplier of 5 (a 20% requirement). E: off by a factor of ten.
Fix: Maximum money-supply change = injection ÷ reserve requirement.
7. E. Tighter money raises rates, cuts investment, and shifts aggregate demand left, lowering both output and the price level. A and C: monetary policy works through aggregate demand, not the supply curves. B: that is the expansionary description. D: something must shift for equilibrium to move.
Fix: Monetary policy is an aggregate-demand story — pick the direction, shift aggregate demand, read both output and price level.
8. E. Banks pay for the bonds with reserves, so reserves fall by \$5 billion, and lending and deposits contract by the multiplier logic. A: backwards — selling drains, not adds. B: expansion is the buy-side result. C: required reserves fall as deposits shrink; the cause is the reserve drain. D: lending contracts, not expands.
Fix: Selling bonds drains reserves and shrinks the money supply; the multiplier runs in reverse.
9. D. From full employment, monetary stimulus raises aggregate demand temporarily, but in the long run wages and prices adjust: the price level ends higher and output returns to potential (money neutrality). A and B: money cannot permanently raise output or lower unemployment below the natural rate. C: prices rise, not fall. E: money does not move long-run aggregate supply.
Fix: In the long run money is neutral — stimulus at full employment buys higher prices, not more output.
10. A. The discount rate is what the central bank charges banks for short-term loans. B: that describes the interbank overnight rate, a different rate. C, D, E: unrelated market or legal rates.
Fix: Discount rate = central-bank-to-bank loan rate; do not confuse it with the interbank rate.
11. E. An inflationary gap calls for tightening: sell bonds and raise the discount rate. A, B, C: each points the tool the wrong way for the stated gap. D: lowering the reserve requirement is expansionary, wrong for inflation.
Fix: Diagnose the gap first; the tool direction follows automatically.
12. B. Even with low rates, if firms will not borrow and invest, monetary policy loses traction — a real limitation. A: no reserve drain or reversal is described. C: crowding out involves government borrowing, absent here. D: neutrality is a long-run price-level idea, not this short-run weakness. E: no reserve-requirement change occurred.
Fix: Low rates cannot force investment; weak borrowing is a classic limit on monetary policy.
1. B. The central bank chooses the money stock, and that quantity does not change when the interest rate changes, so the supply curve is vertical. A: money demand does shift, but its behavior is a separate curve. C: quantity supplied is fixed by policy, not raised by higher rates. D: banks create deposits, but the central bank controls the monetary base. E: velocity belongs to the quantity theory, not to the shape of money supply. Fix: A vertical money supply means "quantity set by policy, unresponsive to the rate."
2. D. A recession calls for expansion, and the expansionary open market operation is buying bonds, which injects reserves. A, B, C: all contractionary directions. E: cutting government spending is fiscal policy and is contractionary besides. Fix: Recession → buy bonds; confirm you picked a central-bank tool, not a fiscal one.
3. C. A bond purchase adds reserves, shifting the vertical money supply right, so the rate falls along money demand. A: demand did not move. B: money supply stays vertical wherever it sits. D: demand is unchanged. E: the reserve injection is immediate, not delayed. Fix: Open market operations move the money supply line; read the new rate off money demand.
4. A. The four-link chain runs money up, rate down, investment up, aggregate demand right, output up. B: describes contraction. C: the rate direction is wrong and saving is not the channel. D and E: these are fiscal chains (taxes, government spending), not monetary. Fix: Monetary transmission is money supply → interest rate → investment → aggregate demand → GDP; fiscal tools are a different institution.
5. C. Selling securities drains reserves, shrinking the money supply and raising rates — the contractionary move. A and D: those ease policy. B: buying expands. E: transfers are fiscal and expansionary. Fix: To fight inflation with a classic tool, sell bonds ("sell = smaller money supply").
6. D. The money multiplier is 1 ÷ 0.10 = 10, so the maximum increase is 10 × \$10 million = \$100 million. A: that is the injection itself, not the multiplied total. B: divides instead of multiplying. C: uses a multiplier of 5 (a 20% requirement). E: off by a factor of ten. Fix: Maximum money-supply change = injection ÷ reserve requirement.
7. E. Tighter money raises rates, cuts investment, and shifts aggregate demand left, lowering both output and the price level. A and C: monetary policy works through aggregate demand, not the supply curves. B: that is the expansionary description. D: something must shift for equilibrium to move. Fix: Monetary policy is an aggregate-demand story — pick the direction, shift aggregate demand, read both output and price level.
8. E. Banks pay for the bonds with reserves, so reserves fall by \$5 billion, and lending and deposits contract by the multiplier logic. A: backwards — selling drains, not adds. B: expansion is the buy-side result. C: required reserves fall as deposits shrink; the cause is the reserve drain. D: lending contracts, not expands. Fix: Selling bonds drains reserves and shrinks the money supply; the multiplier runs in reverse.
9. D. From full employment, monetary stimulus raises aggregate demand temporarily, but in the long run wages and prices adjust: the price level ends higher and output returns to potential (money neutrality). A and B: money cannot permanently raise output or lower unemployment below the natural rate. C: prices rise, not fall. E: money does not move long-run aggregate supply. Fix: In the long run money is neutral — stimulus at full employment buys higher prices, not more output.
10. A. The discount rate is what the central bank charges banks for short-term loans. B: that describes the interbank overnight rate, a different rate. C, D, E: unrelated market or legal rates. Fix: Discount rate = central-bank-to-bank loan rate; do not confuse it with the interbank rate.
11. E. An inflationary gap calls for tightening: sell bonds and raise the discount rate. A, B, C: each points the tool the wrong way for the stated gap. D: lowering the reserve requirement is expansionary, wrong for inflation. Fix: Diagnose the gap first; the tool direction follows automatically.
12. B. Even with low rates, if firms will not borrow and invest, monetary policy loses traction — a real limitation. A: no reserve drain or reversal is described. C: crowding out involves government borrowing, absent here. D: neutrality is a long-run price-level idea, not this short-run weakness. E: no reserve-requirement change occurred. Fix: Low rates cannot force investment; weak borrowing is a classic limit on monetary policy.