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The rebuilding macroeconomic theory project part II: multiple equilibria, toy models, and policy models in a new macroeconomic paradigm
Oxford Review of Economic Policy ( IF 6.326 ) Pub Date : 2021-01-19 , DOI: 10.1093/oxrep/graa066
David Vines 1 , Samuel Wills 2
Affiliation  

This issue of the Oxford Review of Economic Policy is the second in the Rebuilding Macroeconomic Theory project. The papers in the first issue proposed specific improvements to the New-Keynesian Dynamic Stochastic General Equilibrium (NK-DSGE) framework, in response to the events of the 2008 crisis. This issue goes further. We, as editors, now argue that a new multiple-equilibrium and diverse (MEADE) paradigm is needed for macroeconomics. It will emphasize that economies can have more than one stable outcome, and study why. It will require using both toy models, which enable a quick, first-pass, intuitive understanding of a question, and policy models (aka structural economic models) which develop a detailed empirical understanding of the economy. We argue that the seminal IS/LM, Solow–Swan, Ramsey, Real Business Cycle, Taylor, and Clarida/Galí/Gertler models have all been toys, as is the benchmark NK-DSGE model. In the past the models have adapted as the questions changed, and the NK-DSGE model must now do this since it has failed to capture both the salient aspects of the lead-up to the 2008 crisis and the slow recovery afterwards. The way forward in the MEADE paradigm will be to start with simple models, ideally two-dimensional sketches, that explain mechanisms that can cause multiple equilibria. These mechanisms should then be incorporated into larger DSGE models in a new, multiple-equilibrium synthesis. All of this will need to be informed by closer fidelity to the data, drawing on lessons obtained from detailed work on policy models.

中文翻译:

重建宏观经济理论项目第二部分:新的宏观经济范式中的多重均衡,玩具模型和政策模型

本期《牛津经济政策评论》是“重建宏观经济理论”项目中的第二个项目。第一期的论文针对2008年危机事件,提出了对新凯恩斯动态随机一般均衡(NK-DSGE)框架的具体改进。这个问题更进一步。作为编辑,我们现在认为,宏观经济学需要一种新的多元均衡和多元(MEADE)范式。它将强调,经济可以有多个稳定的结果,并研究原因。这将需要同时使用玩具模型和政策模型(可以对问题进行快速的,初次通过,直观的理解),而政策模型(也称为结构经济模型)则需要对经济进行详细的经验理解。我们认为,开创性的IS / LM,Solow-Swan,Ramsey,Real Business Cycle,Taylor和Clarida /Galí/ Gertler模型都是玩具,和基准NK-DSGE模型一样。过去,模型随着问题的变化而适应,而NK-DSGE模型现在必须做到这一点,因为它无法同时捕捉到2008年危机的前兆和随后的缓慢复苏。MEADE范式的前进之路将始于简单的模型,最好是二维草图,这些模型解释了可能导致多重均衡的机制。然后,应在新的多平衡综合中将这些机制合并到较大的DSGE模型中。所有这些都需要通过从政策模型的详细工作中汲取的经验教训来更加忠实地告知数据。NK-DSGE模型现在必须做到这一点,因为它无法同时捕捉到2008年金融危机前的重要方面以及随后的缓慢复苏。MEADE范式的前进之路将始于简单的模型,最好是二维草图,这些模型解释了可能导致多重均衡的机制。然后,应在新的多平衡综合中将这些机制合并到较大的DSGE模型中。所有这些都需要通过从政策模型的详细工作中汲取的经验教训来更加忠实地告知数据。NK-DSGE模型现在必须做到这一点,因为它无法同时捕捉到2008年金融危机前的重要方面以及随后的缓慢复苏。MEADE范式的前进之路将始于简单的模型,最好是二维草图,这些模型解释了可能导致多重均衡的机制。然后,应在新的多平衡综合中将这些机制合并到较大的DSGE模型中。所有这些都需要通过从政策模型的详细工作中汲取的经验教训来更加忠实地告知数据。然后,应在新的多平衡综合中将这些机制合并到较大的DSGE模型中。所有这些都需要通过从政策模型的详细工作中汲取的经验教训来更加忠实地告知数据。然后,应在新的多平衡综合中将这些机制合并到较大的DSGE模型中。所有这些都需要通过从政策模型的详细工作中汲取的经验教训来更加忠实地告知数据。
更新日期:2021-01-20
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