Inflacja w modelu z endogeniczną częstotliwością aktualizacji cen
Inflation in a Model With Endogenous Frequency of Price Changes

Summary/Abstract: The key element in the contemporary DSGE models is the mechanism of nominal rigidity. Usually, the simple model developed by Calvo (1983) is used, which assumes purely random price changes. This approach does not explain the sources of price rigidity, and the state of the economy does not affect the frequency of price updating. The paper presents an alternative model of price rigidity, developed by Dotsey, King, and Wolman (1999). Price changes in this model result from comparing menu costs with the benefits of price changes. In such an approach, the decisions about price updating are endogenous (state-dependent), depending on the state of the economy. In the longrun equilibrium, the main parameters that determine the frequency of price changes are: monopolistic profit markup, equilibrium inflation rate, and the maximum level of menu costs. The equation that describes inflation (the so-called state-dependent Phillips curve) has a more complicated form as compared with its equivalent in the Calvo model. The equation implies that inflation in the short run depends on the expected inflation and marginal costs, and past inflation (with an infinite lag range). The authors compare DSGE models calibrated for Poland with the mechanisms proposed by Calvo and by Dotsey, King and Wolman. On the basis of the response function we can say that the reaction of the economy in the Calvo model is stronger than in the Dotsey, King and Wolman model while the return to equilibrium is quicker (especially in the case of preference shocks and monetary shocks).

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