Difficulty: Intermediate | Prerequisites: Parts 1 and 2 of these notes (money demand, equilibrium interest rate).
Big picture: Parts 1 and 2 built the money market model. This section applies it: what does the Fed do during inflation versus recession, and what do "tight" and "easy" monetary policy mean in practice? The appendix material then introduces the different interest rates that exist in the real economy, how they relate to each other, and how the expectations theory links short-term and long-term rates. This is where the textbook model meets the vocabulary you will hear in financial news.
Source: Principles of Macroeconomics, Case/Fair, 8e – Chapter 11, Sections 11.3 and 11.4 (Appendix A)
Tags: tight monetary policy, easy monetary policy, contractionary policy, expansionary policy, federal funds rate, discount rate, prime rate, Treasury bills, government bonds, term structure of interest rates, expectations theory, commercial paper, AAA corporate bond rate
Tight monetary policy contracts the money supply to fight inflation; easy monetary policy expands it to fight unemployment. In the real world there are many interest rates, not just one. The federal funds rate is the overnight interbank rate, the most closely watched short-term rate is the three-month Treasury bill rate, and the expectations theory says long-term rates are averages of expected future short-term rates.
Tight (contractionary) monetary policy
Actions by the Fed that contract the money supply and raise interest rates. Used to slow down an overheating economy or fight inflation. Examples: selling government securities, raising the reserve requirement, raising the discount rate.
Easy (expansionary) monetary policy
Actions by the Fed that expand the money supply and lower interest rates. Used to stimulate the economy during recession or high unemployment. Examples: buying government securities, lowering the reserve requirement, lowering the discount rate.
Federal funds rate
The interest rate banks charge each other for overnight (one-day) loans of reserves. This is the rate the Fed controls most directly through open-market operations. Think of it as the wholesale price of money between banks.
Treasury bill (T-bill) rate
The interest rate on government securities that mature in less than one year. The three-month T-bill rate is the most widely followed short-term interest rate.
Government bonds
Government securities with maturities of more than one year. Longer-term than Treasury bills.
Prime rate
The interest rate banks charge their most creditworthy corporate borrowers. If you take out an unsecured personal loan, your rate will almost certainly be above the prime rate.
Commercial paper
A short-term IOU issued by a corporation. Essentially a way for large companies to borrow directly from investors for brief periods.
AAA corporate bond rate
The interest rate paid on bonds issued by the least risky (highest-rated) corporations.
Expectations theory of the term structure
The idea that the interest rate on a long-term security equals the average of the short-term rates expected over that security's life. In simple terms, a two-year bond rate is roughly the average of this year's one-year rate and next year's expected one-year rate.
High inflation → the Fed tightens. It contracts the money supply (sells securities, raises reserve requirements, raises the discount rate). Interest rates rise, borrowing becomes more expensive, spending slows, inflationary pressure eases.
High unemployment / recession → the Fed eases. It expands the money supply (buys securities, lowers reserve requirements, lowers the discount rate). Interest rates fall, borrowing becomes cheaper, spending and investment pick up.
Tight policy examples: selling government securities on the open market, increasing the reserve requirement, increasing the discount rate, increasing the federal funds rate target.
Easy policy examples: buying government securities on the open market, decreasing the reserve requirement, decreasing the discount rate.
Common trick question: "To increase the money supply and decrease interest rates, the Fed could sell government securities." This is false. Selling securities decreases the money supply and raises rates.
Federal funds rate – overnight, interbank. Changes daily. The Fed's primary lever.
Treasury bill rate – short-term government debt, under one year. The most widely watched short-term rate in the broader market.
Prime rate – what banks charge their best corporate customers. Your personal loan rate sits above this.
AAA corporate bond rate – what the safest large firms pay to borrow long-term.
Commercial paper rate – short-term corporate IOUs.
All these rates tend to move together because they are linked through arbitrage and competition in financial markets, but they are not identical.
A two-year interest rate should equal the average of the current one-year rate and the expected one-year rate for next year.
Formula: Two-year rate = (Current one-year rate + Expected one-year rate next year) / 2.
Example: current one-year rate is 5%, expected one-year rate next year is 7%. The two-year rate = (5% + 7%) / 2 = 6%.
Example: current one-year rate is 7%, expected one-year rate next year is 9%. The two-year rate = (7% + 9%) / 2 = 8%.
This means the Fed can influence long-term rates in two ways: by changing the current short-term rate, and by shaping expectations about future short-term rates.
Expectations theory (two-year rate):
Two-year rate = (Current one-year rate + Expected one-year rate next year) / 2
This generalises: an n-year rate is the average of the n expected future one-year rates.
When financial news says the Fed "cut rates by 25 basis points," they typically mean the federal funds rate target was lowered. That single move ripples outward: Treasury bill yields adjust, the prime rate follows, mortgage rates shift, and corporate borrowing costs change. The expectations theory explains why long-term mortgage rates sometimes move before the Fed acts: markets price in what they expect the Fed to do.
Students often think tight monetary policy stimulates the economy. It does the opposite: tight policy is contractionary and slows things down.
Students sometimes think monetary easing raises the interest rate. Easing expands the money supply and lowers the rate.
Students confuse the federal funds rate with the discount rate. The federal funds rate is what banks charge each other; the discount rate is what the Fed charges banks directly.
Students sometimes believe the prime rate is the most widely followed short-term rate. It is the three-month Treasury bill rate that holds that distinction.
⚠️ Know the difference between tight and easy policy, and be able to identify examples of each from a list of Fed actions.
⚠️ The expectations theory calculation is a frequent exam question. Practise averaging two one-year rates to get the two-year rate.
⚠️ Be able to match each interest rate to its definition: federal funds (overnight interbank), T-bill (government, under one year), government bonds (government, over one year), prime (best corporate customers), commercial paper (short-term corporate IOU), AAA corporate bond (least risky firms).
⚠️ Remember that the Fed influences long-term rates through both current short-term rate changes and expectations management.
True or false: In a period of high inflation, the Fed would most likely ease monetary policy.
False. It would tighten.
"Easy" monetary policy means the Fed is taking actions to ________ the money supply.
Expand.
The interest rate banks charge each other for overnight loans is the ________.
Federal funds rate.
If the current one-year rate is 4% and the expected one-year rate next year is 6%, the two-year rate according to the expectations theory is ________.
5%.
True or false: The Fed selling government securities is an example of easy monetary policy.
False. It is tight (contractionary) policy.
Q: In a period of high unemployment, what would the Fed most likely do?
A: Ease monetary policy by expanding the money supply (buying government securities, lowering the reserve requirement, or lowering the discount rate) to reduce interest rates and stimulate spending.
Q: What does "tight monetary policy" mean?
A: The Federal Reserve is taking actions that contract the money supply, which raises interest rates and slows economic activity.
Q: Give two examples of tight monetary policy.
A: (1) The Fed selling government securities in the open market. (2) An increase in the reserve requirement.
Q: What is the most widely followed short-term interest rate?
A: The three-month Treasury bill rate.
Q: What are federal funds?
A: Interbank loans, specifically overnight loans of reserves between commercial banks.
Q: The current one-year interest rate on a bond is 7%, and the expected one-year rate a year from now is 9%. According to the expectations theory, what is the two-year rate?
A: 8%. Calculated as (7% + 9%) / 2.
Q: How can the Fed influence long-term interest rates?
A: By influencing the current short-term rate (through open-market operations) and by affecting people's expectations of future short-term rates.
Q: What is the difference between Treasury bills and government bonds?
A: Treasury bills are government securities that mature in less than one year. Government bonds are government securities with maturities of more than one year.
Q: On an unsecured personal loan, would your bank charge above or below the prime rate?
A: Above the prime rate. The prime rate is for the most creditworthy corporate borrowers; personal unsecured loans carry more risk.
Q: If the Federal Reserve lowers the discount rate, is this easing or tightening?
A: Easing. It encourages banks to borrow more reserves, expanding the money supply and lowering interest rates.
Monetary policy connects directly to the aggregate demand curve (Chapter 12 and beyond). Easy policy lowers interest rates, raises planned investment, increases aggregate expenditure and shifts AD right. Tight policy does the reverse. Understanding the difference between fiscal policy (government spending and taxes) and monetary policy (the Fed's control of the money supply) is a recurring exam theme through the rest of the course.
The expectations theory links to financial markets more broadly. If you continue into intermediate macroeconomics or finance, the yield curve (the graph of interest rates across different maturities) builds on this foundation.
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