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Expectation Formation and Monetary DSGE Models: Beyond the Rational Expectations Paradigm

Fabio Milani () and Ashish Rajbhandari ()

No 111212, Working Papers from University of California-Irvine, Department of Economics

Abstract: Empirical work in macroeconomics almost universally relies on the hypothesis of rational expectations. This paper departs from the literature by considering a variety of alternative expectations formation models. We study the econometric properties of a popular New Keynesian monetary DSGE model under different expectational assumptions: the benchmark case of rational expectations, rational expectations extended to allow for `news' about future shocks, near-rational expectations and learning, and observed subjective expectations from surveys. The results show that the econometric evaluation of the model is extremely sensitive to how expectations are modeled. The posterior distributions for the structural parameters significantly shift when the assumption of rational expectations is modified. Estimates of the structural disturbances under different expectation processes are often dissimilar. The modeling of expectations has important effects on the ability of the model to fit macroeconomic time series. The model achieves its worse fit under rational expectations. The introduction of news improves fit. The best-fitting specifications, however, are those that assume learning. Expectations also have large effects on forecasting. Survey expectations, news, and learning all work to improve the model's one-step-ahead forecasting accuracy. Rational expectations, however, dominate over longer horizons, such as one-year ahead or beyond.

Keywords: Expectation formation; Rational expectations; News shocks; Adaptive learning; Survey expectations; Econometric evaluation of DSGE models; Forecasting (search for similar items in EconPapers)
JEL-codes: C52 D84 E32 E37 E50 (search for similar items in EconPapers)
Pages: 31 pages
Date: 2012-06
New Economics Papers: this item is included in nep-dge, nep-for, nep-mac and nep-mon
References: View references in EconPapers View complete reference list from CitEc
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Persistent link: https://EconPapers.repec.org/RePEc:irv:wpaper:111212

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