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Ratings Reveal Risk
In an interesting article (Oct. 15, 1994), Professor Brooks Marshall suggests that bond ratings are a poor predictor of equity risk, based on a regression of utility risk measures on measures of utility bond ratings. For utility variables, he used 1) stock beta and 2) risk premiums based on analysts' expected forecasts. For bond rating measures, he used 1) average yields for various classes of bonds and 2) a numerical ranking.