Utility Functions For Central Bankers: The Not So Drastic Quadratic
Following Blinders (1997) suggestion, we examine the implications for the optimal interest rate rule which follows from relaxing the assumption that the policymakers loss function is quadratic. We investigate deviations from quadratics for both symmetric and asymmetric preferences for a single target and find that (i) other characterizations of risk aversion than implied by the quadratic only affect dead-weight losses, unless there is multiplicative uncertainty; (ii) asymmetries affect the optimal rule under both additive and multiplicative uncertainty but result in interest rate paths observationally similar, and in some cases equivalent to those implied by a shifted quadratic; (iii) the use of asymmetric loss functions leads to important insights on the issue of goal independence and monetary policy delegation: (iv) non-quadratic preferences per se, are neither sufficient nor necessary to generate the Brainard conservatism principle and thus do not offer much added value when analyzing policy issues of caution and gradualism. Our results suggest that in the context of monetary policymaking the convenient assumption of quadratic losses may not be that drastic after all.
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