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Heterogeneity and aggregate fluctuations: insights from TANK models

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Abstract

We analyze the merits and limitations of simple tractable New Keynesian models (RANK and TANK) in accounting for the aggregate predictions of Heterogenous Agent New Keynesian models (HANK). By means of comparison of a number of nested HANK models, we isolate the role played by (i) idiosyncratic income risk, (ii) a binding borrowing constraint, and (iii) a portfolio choice between liquid and iliquid assets. We argue that the effects of household heterogeneity can be largely understood looking at the differential behavior of two types of households, hand-to-mouth and unconstrained, We find that a suitably specified and calibrated TANK model (which abstracts from idiosyncratic income risk) captures reasonably well the aggregate implications of household heterogeneity and the main channels through which it operates. That ability increases in the presence of a policy rule that emphasizes inflation stability. In the limiting case of a strict inflation targeting policy, heterogeneity becomes irrelevant for the determination of aggregate output.

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  • Davide Debortoli & Jordi Galí, 2024. "Heterogeneity and aggregate fluctuations: insights from TANK models," Economics Working Papers 1882, Department of Economics and Business, Universitat Pompeu Fabra.
    • Handle: RePEc:upf:upfgen:1882
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    Cited by:

    1. Bilbiie, Florin O. & Monacelli, Tommaso & Perotti, Roberto, 2024. "Stabilization vs. Redistribution: The optimal monetary–fiscal mix," Journal of Monetary Economics, Elsevier, vol. 147(S).
    2. Bartocci, Anna & Cantelmo, Alessandro & Cova, Pietro & Notarpietro, Alessandro & Pisani, Massimiliano, 2024. "Monetary and fiscal policy responses to fossil fuel price shocks," Energy Economics, Elsevier, vol. 136(C).
    3. Kozo UEDA & Fei Gao, 2024. "How Do Gamblers React to Wins? Evidence from Bank Transaction Data in Japan," CIGS Working Paper Series 24-019E, The Canon Institute for Global Studies.

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    More about this item

    Keywords

    monetary policy; idiosyncratic income risk; incomplete markets; representative household; New Keynesian model; HANK models;
    All these keywords.

    JEL classification:

    • E32 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Business Fluctuations; Cycles
    • E52 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Monetary Policy

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