Quick Answer
Inflation risk, also called purchasing power risk, is the chance rising prices reduce an investment's real return. Long-term fixed-rate bonds suffer most, since their payments stay fixed for decades while prices rise; cash also loses ground when its rate trails inflation. Treasury Inflation-Protected Securities, equities, and real estate offer better protection, because their value can rise with inflation too.
Credit risk threatens whether you get paid. Inflation risk threatens whether those payments are worth anything when you receive them.
What Is Inflation Risk?
- Inflation risk (also called purchasing power risk) is the risk that rising prices reduce the real return on an investment
- Real return = nominal return minus inflation
- If your bond pays 3% but inflation is 4%, your purchasing power is actually declining
- This risk operates silently: you still receive your payments, but each dollar buys less
Think of it this way: Your bond still pays the same $50 every year. But if a gallon of milk went from $4 to $6, that $50 covers fewer groceries than it used to. Your dollars are the same; their buying power is not.
Which Investments Are Most Vulnerable?
| Security | Inflation Risk Level | Why |
|---|---|---|
| Long-term fixed-rate bonds (such as 30-year Treasury bonds) | Highest | Fixed payments locked in for decades |
| Cash / savings accounts | High | Low rates often trail inflation, but the rate is not locked in for years |
| Short-term bonds / T-Bills | Moderate | Shorter terms allow faster rate adjustment |
| TIPS | Very low | Principal adjusts with Consumer Price Index (CPI) |
| Equities | Lower | Company earnings can grow with rising prices |
| Real estate / REITs | Lower | Property values and rents tend to rise with inflation |
Key Relationships
- Fixed-income investments are most vulnerable because their payments are fixed in nominal terms
- A bond paying $50 per year buys the same goods whether inflation is 1% or 10%. At 10% inflation, that $50 is worth significantly less in real terms
- Equities offer better inflation protection because companies can raise prices, increasing revenues and earnings
- TIPS (Treasury Inflation-Protected Securities) directly address inflation risk. The principal adjusts with changes in the CPI, and interest is paid every six months on the adjusted principal
- Real assets (real estate, commodities) can also act as inflation hedges
Exam Tip: Gotchas
- Fixed-income securities (especially long-term bonds) are the most vulnerable to inflation risk. Equities offer better inflation protection because company earnings can grow with rising prices.
- The exam frequently tests which asset class is most/least affected by inflation. Long-term fixed-rate bonds are the most exposed. Cash also erodes when its rate trails inflation, but short instruments such as Treasury bills mature quickly and reinvest at new rates. Equities and real assets are least exposed.
- Government backing does not protect purchasing power. A 30-year Treasury bond has virtually no credit risk, yet it carries more inflation risk than a Treasury bill, because its fixed payments run for decades.
Inflation drives central bank policy, which in turn drives interest rates. Next, we'll see how changing interest rates create their own form of risk for bond investors.
What Should You Check on Exam Day?
- Can you explain why long-term fixed-rate bonds are the most vulnerable to inflation risk, more than cash or Treasury bills?
- Do you know how real return differs from nominal return?
- Can you state why equities and real estate offer better inflation protection than bonds?
- Do you know how Treasury Inflation-Protected Securities adjust for inflation?