"Is it safe?" is the question clients ask most, and an honest answer always names a specific risk. A Treasury bond cannot default, yet it can lose real market value when rates jump. A well-run company's stock can still fall hard in a recession it did nothing to cause.
To manage a client's risk, you first have to sort it. Some risk disappears when the client owns more securities, and more varied ones. Some stays no matter how many holdings you add. Portfolio theory splits total risk into those two parts:
- Systematic risk: This is market-wide risk from forces that hit nearly every security at once, such as recessions, inflation, interest rate changes and war. Diversification cannot remove it.
- Unsystematic risk: This is issuer-specific risk from events at one company, such as a failed product or an accounting scandal. Holding many issuers across industries largely removes it.
Total risk equals systematic risk plus unsystematic risk. Diversification works because prices across the market don't move in lockstep, so the others dilute one holding's bad news.
Common mistakes
- Crediting diversification with cutting beta. Going from 30 stocks to 300 shrinks issuer-specific risk. A portfolio with a beta of 1.0 still falls about as far as the market.
- Treating credit quality as safety. A Treasury or AAA fund dodges default, not rate or inflation risk. A 2.5% Treasury yield with 3% inflation is still a −0.5% real return.
- Swapping interest rate and reinvestment risk. A short T-bill is the least hurt by rising rates, not the most. A zero held to maturity has no reinvestment risk when rates fall.
Bottom line
- Holding many issuers across industries largely removes unsystematic (issuer-specific) risk but leaves systematic (market-wide) risk, the only part beta measures.
- Rising rates cut prices of existing bonds, preferreds, utilities and REITs, hitting long-term, low-coupon and zero-coupon bonds hardest.
- Falling rates create reinvestment risk, highest for callable bonds and zero for zero-coupon bonds held to maturity.
- Market risk pulls down nearly all stocks whatever their quality, and only a lower stock allocation or hedging reduces it.
Exam shortcut
When a risk question appears, first ask whether more holdings would fix it. If adding companies across industries cures it, the risk is unsystematic. If nothing cures it, the risk is systematic, and only asset allocation or hedging helps. Next, check the rate direction. Rising rates point to interest rate risk, and falling rates point to reinvestment risk. A "safe" Treasury or AAA holding still carries rate and inflation risk.
The full lesson (about 4,545 words, 30 min read) adds 2 worked examples, all 6 common mistakes, a self-check, free in the app.
Learning objectives
- A4
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