Survey by Cars Hommes published in the Journal of Economic Literature
In ‘Behavioral and Experimental Macroeconomics and Policy Analysis: A Complex Systems Approach,' a survey published in the Journal of Economic Literature, research fellow Cars Hommes (University of Amsterdam and Bank of Canada) looks closely on under which conditions a complex macro-system of interacting agents may or may not coordinate on the rational equilibrium outcome.
This survey discusses behavioral and experimental macroeconomics, emphasizing a complex systems perspective. The economy consists of boundedly rational heterogeneous agents who do not fully understand their complex environment and use simple decision heuristics. Central to our survey is the question of under which conditions a complex macro-system of interacting agents may or may not coordinate on the rational equilibrium outcome. A general finding is that under positive expectations feedback (strategic complementarity)—where optimistic (pessimistic) expectations can cause a boom (bust)—coordination failures are quite common. The economy is then rather unstable, and persistent aggregate fluctuations arise strongly amplified by coordination on trend-following behavior leading to (almost-)self-fulfilling equilibria. Heterogeneous expectations and heuristics switching models match this observed micro and macro behavior surprisingly well. We also discuss policy implications of this coordination failure on the perfectly rational aggregate outcome and how policy can help to manage the self-organization process of a complex economic system.
Cars Hommes, “Behavioral and Experimental Macroeconomics and Policy Analysis: A Complex Systems Approach”, Journal of Economic Literature, Volume 59, Issue 1, March 2021, pages 149-219, https://doi.org/10.1257/jel.20191434.