Money Markets and Fixed Income Securities

TL;DR

Money markets deal with short-term borrowing and lending, typically less than a year, providing liquidity for financial institutions and governments. Fixed income securities, like bonds, represent debt where you lend money in exchange for regular interest payments and repayment of principal. Understanding these markets helps you grasp how entities manage short-term cash needs and how investors seek stable returns.

1. The Mental Model

Think of money markets as a giant, super-fast ATM for big players needing quick cash or a safe place for short-term funds. Fixed income securities are more like long-term loans you give out, expecting a steady stream of payments back over time. They're all about borrowing and lending money, just over different time horizons.

2. The Core Material

Money Markets: Short-Term Lending & Borrowing

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Money markets are where participants borrow and lend funds for short periods, usually less than one year. These instruments are highly liquid and have low default risk, making them ideal for managing short-term cash flows.

Here are some key money market instruments:

• Treasury Bills (T-Bills): Short-term debt obligations of the U.S. government. They're sold at a discount to their face value and don't pay interest directly; you earn money from the difference between your purchase price and the face value at maturity. Maturities are typically 4, 8, 13, 17, 26, or 52 weeks.
• Commercial Paper (CP): Short-term, unsecured promissory notes issued by large corporations to finance their short-term needs like inventory and accounts receivable. Maturities usually range from a few days to 270 days.
• Certificates of Deposit (CDs): Time deposits with banks. You deposit a sum for a fixed period (e.g., 3 months, 6 months, 1 year) at a fixed interest rate. You can't withdraw the money before maturity without penalty.
• Repurchase Agreements (Repos): A firm sells a security (often a T-bill) to another party with an agreement to repurchase it at a higher price on a specific future date. It's essentially a short-term, collateralized loan. The difference between the sale and repurchase price is the interest.
• Federal Funds: Overnight loans between banks to meet reserve requirements. The interest rate on these loans is the federal funds rate, a key interest rate targeted by the Federal Reserve.

Fixed Income Securities: Long-Term Debt

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Fixed income securities are debt instruments that pay a fixed stream of income to the investor. The most common type is a bond. When you buy a bond, you're lending money to the issuer (government, corporation, municipality). In return, the issuer promises to:

1. Pay you regular interest payments (called coupon payments) over a specified period.
2. Repay the original amount borrowed (the principal or face value) at the end of the bond's term (the maturity date).

Key bond terms:

• Face Value (Par Value): The amount the issuer promises to repay at maturity, typically $1,000.
• Coupon Rate: The annual interest rate paid on the bond's face value. If a bond has a 5% coupon rate and a $1,000 face value, it pays $50 per year.
• Coupon Payment: The actual dollar amount of interest paid. This is usually paid semi-annually. So, a $50 annual coupon would be two $25 payments.
• Maturity Date: The date when the principal is repaid.
• Yield to Maturity (YTM): The total return an investor can expect to receive if they hold the bond until maturity, taking into account its current market price, par value, coupon interest rate, and time to maturity. It's the discount rate that equates the present value of the bond's future cash flows (coupon payments and principal) to its current market price.

Bond Pricing: The price of a bond is the present value of its future cash flows (coupon payments + face value). Bond prices move inversely to interest rates. If market interest rates rise, newly issued bonds offer higher coupons, making existing bonds with lower coupons less attractive, so their price falls. Conversely, if market rates fall, existing bonds with higher coupons become more attractive, and their price rises.

graph TD
    A["Issuer (Gov't/Corp) needs Funds"] --> B{"Money Market or Fixed Income?"}
    B -- "Short-term (<1 year)" --> C["Money Market Instruments"]
    C --> D1["Treasury Bills (Discount)"]
    C --> D2["Commercial Paper (Unsecured Corp Debt)"]
    C --> D3["Certificates of Deposit (Bank Time Deposit)"]
    C --> D4["Repurchase Agreements (Collateralized Loan)"]
    B -- "Long-term (>1 year)" --> E["Fixed Income Securities (Bonds)"]
    E --> F1["Corporate Bonds"]
    E --> F2["Government Bonds (Treasuries)"]
    E --> F3["Municipal Bonds"]
    F1 --> G1["Investor lends money"]
    F2 --> G1
    F3 --> G1
    G1 --> H["Issuer pays regular Coupon Payments"]
    H --> I["Issuer repays Face Value at Maturity"]

3. Worked Example

Let's say you're considering buying a corporate bond.

Bond Details:
* Face Value: $1,000
* Coupon Rate: 5%
* Maturity: 3 years
* Coupon Payments: Semi-annual

Calculation of Coupon Payments:
Annual coupon payment = 5% of $1,000 = $50.
Since payments are semi-annual, each payment is $50 / 2 = $25.
Total payments over 3 years = 3 years * 2 payments/year = 6 payments.

Now, let's calculate the Yield to Maturity (YTM) if this bond is currently trading at $980 (a discount). We'll approximate YTM using a financial calculator or software, as it requires solving for 'r' in a present value formula.

Using a financial calculator (or Excel's YIELD function):
* N (Number of periods) = 3 years * 2 = 6
* PV (Present Value / Current Price) = -$980 (negative because it's an outflow)
* PMT (Payment per period) = $25
* FV (Future Value / Face Value) = $1,000

Solving for I/Y (Interest rate per period) gives approximately 2.92%.
Since this is a semi-annual rate, the Annual YTM = 2.92% * 2 = 5.84%.

This means if you buy the bond for $980 and hold it to maturity, reinvesting the coupons at this rate, your annual return would be 5.84%. Notice it's higher than the coupon rate because you bought the bond at a discount.

4. Key Takeaways

• Money markets provide short-term liquidity for entities needing to borrow or lend cash for less than a year.
• Treasury Bills are zero-coupon instruments sold at a discount, representing short-term government debt.
• Fixed income securities, primarily bonds, are long-term debt instruments promising regular interest payments and principal repayment.
• Bond prices move inversely to interest rates; when rates rise, bond prices fall, and vice-versa.
• Yield to Maturity (YTM) is the total return an investor expects if they hold a bond until it matures.
• Coupon rate is the stated interest rate on a bond's face value, determining the periodic cash payments.
• Repurchase agreements are essentially short-term, collateralized loans often used by financial institutions.

Common Mistakes to Avoid:
- Don't confuse the coupon rate with the yield to maturity; YTM reflects the actual return based on the current market price, not just the face value.
- Assuming fixed income means zero risk; bonds still carry interest rate risk, inflation risk, and credit risk.
- Thinking all money market instruments pay explicit interest; T-Bills, for example, are discount instruments.
- Forgetting that bond prices are quoted per $100 of face value, so a quote of 98 means $980 for a $1,000 bond.

5. Now Try It

Find a current quote for a U.S. Treasury Bill (e.g., a 13-week T-bill) and a U.S. Treasury Bond (e.g., a 10-year Treasury bond). Note their current yields. Explain in your own words why the T-bill yield is generally lower than the 10-year bond yield. What does this tell you about the relationship between maturity and expected return in normal market conditions? Success looks like correctly identifying current yields for both instruments and clearly articulating the maturity-risk premium concept.