Summary  
This chapter introduces establishing a baseline reference value and comparing other metrics against it to evaluate if taking on additional cost or risk is justified.  

General domain of usage  
Finance (investment evaluation)

Every investment return gets measured against a baseline – the return you could earn by taking **zero risk**. That baseline is called the **risk-free rate**.

In practice, the risk-free rate is the yield on short-term U.S. Treasury bills. The U.S. government has never defaulted on its debt, so T-bills are treated as the closest thing to a guaranteed return that exists in financial markets.

If an investment can't beat the risk-free rate over the long run, there's no rational reason to take on its additional risk.

## Why It Matters for Every Decision

The risk-free rate isn't just a number on a Bloomberg terminal. It's the silent benchmark behind every investment you evaluate.

When the risk-free rate is **low** (near zero, as it was 2010–2021), even modest returns from stocks look attractive by comparison. When it's **high** (as in 2023–2024), suddenly a Treasury bill paying 5% makes riskier assets much harder to justify.

- A **low risk-free rate** pushes investors toward riskier assets in search of return;
- A **high risk-free rate** makes safe assets genuinely competitive;
- Every expected return should be compared against the current risk-free rate before making a decision.

The return an investor can earn with zero default risk, typically represented by the yield on short-term U.S. Treasury bills. It serves as the baseline against which all other investment returns are measured.

Definition

T-bills carry no default risk, but they still carry inflation risk. If the risk-free rate is 4% and inflation is 5%, your real return is negative. "Risk-free" refers specifically to credit risk – the risk that the borrower won't pay you back.

Note

The risk-free rate moves in lockstep with the Federal Reserve's federal funds rate. Understanding how the Fed sets rates explains why the risk-free rate was near zero for a decade and jumped to 5%+ in just 18 months after 2022.

Study More

The risk-free rate rises from 1% to 5%. How does this most likely affect investor behavior?

An investor is evaluating a corporate bond yielding 4.5%. The current risk-free rate is 5.1%. What is the most rational conclusion?

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Risk-Free Rate

Why It Matters for Every Decision

1. The risk-free rate rises from 1% to 5%. How does this most likely affect investor behavior?

2. An investor is evaluating a corporate bond yielding 4.5%. The current risk-free rate is 5.1%. What is the most rational conclusion?