“An asset’s risk premium is driven by the covariance of its returns with the inter-temporal rate of substitution for consumption and can exist even for a default-free bond because of the uncertainty of its price before maturity. Most risky assets have returns that tend to be high during good times, when the marginal value of consumption is low, and low during bad times,when the marginal value of consumption is high, and so bear a positive risk premium. Any asset that tended to have relatively high returns when the marginal utility of consumption was high would provide a type of hedge against bad times, bear a negative risk premium, and have a relatively high price and low required rate of return.”
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