Dampening General Equilibrium: From Micro to Macro / George-Marios Angeletos, Chen Lian.

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Angeletos, George-Marios

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TextSeries: Working Paper Series (National Bureau of Economic Research) ; no. w23379.Publication details: Cambridge, Mass. National Bureau of Economic Research 2017.Description: 1 online resource: illustrations (black and white)Subject(s):

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Abstract: We argue that standard modeling practices often overstate the potency of general-equilibrium (GE) mechanisms. We formalize the notion that GE adjustment is weak, or that it takes time, by modifying an elementary Walrasian economy in two alternative manners. In one, we replace Rational Expectations Equilibrium with solution concepts that mimic Tâtonnement or Cobweb dynamics, Level-k Thinking, Reflective Equilibrium, and certain kinds of cognitive discounting. In the other, we maintain rational expectations but remove common knowledge of aggregate shocks and accommodate higher-order uncertainty. This permits us, not only to illustrate the broader plausibility of the notion that the GE adjustment may be weak or slow, but also to illustrate the sense in which our preferred approach--the one based on lack of common knowledge--can be seen as a disciplined substitute to certain kinds of bounded rationality. We finally discuss possible applications, including how our results may help reduce the gap between the macroeconomic effects of interest and the micro or local effects estimated in a growing empirical literature.

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May 2017.

We argue that standard modeling practices often overstate the potency of general-equilibrium (GE) mechanisms. We formalize the notion that GE adjustment is weak, or that it takes time, by modifying an elementary Walrasian economy in two alternative manners. In one, we replace Rational Expectations Equilibrium with solution concepts that mimic Tâtonnement or Cobweb dynamics, Level-k Thinking, Reflective Equilibrium, and certain kinds of cognitive discounting. In the other, we maintain rational expectations but remove common knowledge of aggregate shocks and accommodate higher-order uncertainty. This permits us, not only to illustrate the broader plausibility of the notion that the GE adjustment may be weak or slow, but also to illustrate the sense in which our preferred approach--the one based on lack of common knowledge--can be seen as a disciplined substitute to certain kinds of bounded rationality. We finally discuss possible applications, including how our results may help reduce the gap between the macroeconomic effects of interest and the micro or local effects estimated in a growing empirical literature.