The Permanent Income Hypothesis Revisited
重新审视永久收入假说
Measured aggregate U.S. consumption does not behave like a martingale. The authors develop and test two variants of the permanent income model which reflect that. In both, agents make decisions in continuous time. In one variant, martingale behavior holds; serial persistence in measured consumption reflects only time aggregation. In the other, serial persistence also reflects technology shocks, and martingale behavior does not hold. Using both structural and atheoretical…