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Online Papers - Brian Weatherson

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Keynes, Uncertainty and Interest Rates 545<br />

goods are more complete. But if that is the case there is a reason to demand that good<br />

even when the world is completely certain. Secondly, the only decision-theoretic<br />

justification for this demand for fixed returns could be the disquiet generated by not<br />

knowing the return. This follows from the formalisation of uncertainty advocated<br />

in sections 1 and 2. But this disquiet could just as easily be generated by risk as by<br />

uncertainty. So Keynes has not shown that uncertainty has any particular economic<br />

impact. That’s the bad news. The good news is that many of the arguments seem to<br />

work without the reliance on uncertainty.

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