Oct

28

Risk, from Duncan Coker

October 28, 2023 |

It seems a misnomer to call longs bonds risk free. Indeed the default risk is near zero, but the interest rates risk is wilder than a bronco at Montana rodeo. Credit risk is also a factor with potential downgrades. Which begs the question will risk premiums decrease equity vs bonds. Which asset class is actually carries more "risk"" on an annual basis.

Big Al asks:

Are long bonds (UST 30s) referred to as "risk free"? I think of the "risk-free rate" as Treasury bills. Whereas with bonds, doesn't longer duration equal greater risk?

William Huggins responds:

the risks of a long-term contract are mostly in getting out early at a bad time (and thus having a holding period yield lower than YTM), default, and of course inflation. if you hold to maturity (liability matching for instance) then the first risk vanishes but the last two remain. in gov bonds, the second risk also vanishes but the third becomes all important since a gov can promise to give you 1000 currency units but makes no reps about what that will buy at maturity.

Hernan Avella writes:

Interest rate volatility is only a problem for people who don't know how to immunize the risk. One should always match the investment horizon to the duration of the bond holdings. To quote Campbell and Viceira:

In financial economics a one-period indexed bond is usually thought of as riskless. Over one period, a nominal bond is a good substitute for an indexed bond, and thus by extension the riskless asset is often identified with a short-term nominal asset such as a Treasury bill. In a world with time-varying interest rates, however, only the current short-term real interest rate is riskless; future short term interest rates are uncertain. This makes a one-period bond risky from the perspective of long-horizon investors. For such investors, a more natural definition fo a riskless asset might be a real perpetuity, since this asset pays a fixed coupon of one unit of consumption per period forever.

In practical terms, given that we do live in the most powerful country in the history of the world and this country issues indexed bonds. For a long term investor, a TIPS ladder to finance your long term consumption is the riskless asset. Which should be 100% of the portfolio of the infinitely risk averse investor with zero intertemporal elasticity of substitution.

Kim Zussman reflects:

The most risk-free state is death because nothing worse (or better) can happen to you. Less severely one likes to lay on the floor. The cool hard surface is good for back pain and there is no further to fall.


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