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Does Household Finance Matter? Small Financial Errors with Large Social Costs

Author

Listed:
  • Harjoat S. Bhamra
  • Raman Uppal

Abstract

Households with familiarity biases tilt their portfolios toward a few risky assets. The resulting mean-variance loss from portfolio underdiversification is equivalent to only a modest reduction of about 1 percent per year in a household's portfolio return. However, once we consider also the effect of familiarity biases on the asset-allocation and intertemporal consumption-savings decisions, the welfare loss is multiplied by a factor of four. In general equilibrium, the suboptimal decisions of households distort also aggregate growth, amplifying further the overall social welfare loss. Our findings demonstrate that financial markets are not a mere sideshow to the real economy and that improving the financial decisions of households can lead to large benefits, not just for individual households, but also for society.

Suggested Citation

  • Harjoat S. Bhamra & Raman Uppal, 2019. "Does Household Finance Matter? Small Financial Errors with Large Social Costs," American Economic Review, American Economic Association, vol. 109(3), pages 1116-1154, March.
    • Handle: RePEc:aea:aecrev:v:109:y:2019:i:3:p:1116-54
    Note: DOI: 10.1257/aer.20161076
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    Cited by:

    1. Raslan Alzuabi & Sarah Brown & Mark N. Harris & Karl Taylor, 2024. "Modelling the composition of household portfolios: A latent class approach," Canadian Journal of Economics/Revue canadienne d'économique, John Wiley & Sons, vol. 57(1), pages 243-275, February.
    2. Firth, Chris, 2020. "Protecting investors from themselves: Evidence from a regulatory intervention," Journal of Behavioral and Experimental Finance, Elsevier, vol. 27(C).
    3. Fong, Joelle H. & Koh, Benedict SK. & Mitchell, Olivia S. & Rohwedder, Susann, 2019. "Financial literacy and suboptimal financial decisions at older ages," CFS Working Paper Series 630, Center for Financial Studies (CFS).
    4. Xiaomeng Lu & Jingna Xiao & Yu Wu, 2021. "Financial literacy and household asset allocation: Evidence from micro‐data in China," Journal of Consumer Affairs, Wiley Blackwell, vol. 55(4), pages 1464-1488, December.
    5. Fong, Joelle H. & Koh, Benedict S.K. & Mitchell, Olivia S. & Rohwedder, Susann, 2021. "Financial literacy and financial decision-making at older ages," Pacific-Basin Finance Journal, Elsevier, vol. 65(C).
    6. Yang Bai & Shize Li & Jialu Shen, 2025. "Homeownership as Life Cycle Goldmine: Evidence from Macrohistory," Papers 2507.17624, arXiv.org.
    7. Sujoy Mukerji & Han N. Ozsoylev & Jean‐Marc Tallon, 2023. "Trading Ambiguity: A Tale Of Two Heterogeneities," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 64(3), pages 1127-1164, August.
    8. Buss, Adrian & Vilkov, Grigory & Uppal, Raman, 2020. "Investor Sophistication and Portfolio Dynamics," CEPR Discussion Papers 15116, C.E.P.R. Discussion Papers.
    9. Li, Jingrong & Mi, Xinyu & Zhang, Chenlei & Qin, Yanran, 2024. "Social pension insurance and household risky asset investment: Evidence from China," The Quarterly Review of Economics and Finance, Elsevier, vol. 95(C), pages 219-233.
    10. Firth, Chris & Stewart, Neil & Antoniou, Constantinos & Leake, David, 2023. "The effects of personality and IQ on portfolio outcomes," Finance Research Letters, Elsevier, vol. 51(C).
    11. Feng, Chen & Bai, Caiquan & Kang, Yankun, 2023. "Historical social capital and contemporary private investment choices," Journal of Corporate Finance, Elsevier, vol. 79(C).
    12. Armantier, Olivier & Foncel, Jérôme & Treich, Nicolas, 2023. "Insurance and portfolio decisions: Two sides of the same coin?," Journal of Financial Economics, Elsevier, vol. 148(3), pages 201-219.
    13. Sias, Richard & Starks, Laura T. & Turtle, H.J., 2023. "The negativity bias and perceived return distributions: Evidence from a pandemic," Journal of Financial Economics, Elsevier, vol. 147(3), pages 627-657.
    14. Zhang, Qianyi, 2025. "AI-driven unemployment risk and household financial decision: Evidence from China," Journal of Asian Economics, Elsevier, vol. 99(C).
    15. Lu, Xiaomeng & He, Zehui & Li, Yaling & Luo, Ronghua, 2025. "Post-compulsory education of children and household asset allocation," Pacific-Basin Finance Journal, Elsevier, vol. 89(C).
    16. Melanie Koch & Thomas Scheiber, 2022. "Household savings in CESEE: expectations, experiences and common predictors," Focus on European Economic Integration, Oesterreichische Nationalbank (Austrian Central Bank), issue Q1/22, pages 29-54.

    More about this item

    JEL classification:

    • D14 - Microeconomics - - Household Behavior - - - Household Saving; Personal Finance
    • D91 - Microeconomics - - Micro-Based Behavioral Economics - - - Role and Effects of Psychological, Emotional, Social, and Cognitive Factors on Decision Making
    • E21 - Macroeconomics and Monetary Economics - - Consumption, Saving, Production, Employment, and Investment - - - Consumption; Saving; Wealth
    • E44 - Macroeconomics and Monetary Economics - - Money and Interest Rates - - - Financial Markets and the Macroeconomy
    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G41 - Financial Economics - - Behavioral Finance - - - Role and Effects of Psychological, Emotional, Social, and Cognitive Factors on Decision Making in Financial Markets

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