From Pandemics to Portfolios: Long-Term Impacts of the 2009 H1N1 Outbreak on Household Investment Choices

Guo, Naijia and Leung, Charles Ka Yui and Zhang, Shumeng (2025): From Pandemics to Portfolios: Long-Term Impacts of the 2009 H1N1 Outbreak on Household Investment Choices.

Abstract

This study examines how experiencing a pandemic affects household investment behaviors. By leveraging cross-state variations in the H1N1 mortality rate in 2009, our difference-in-differences analysis reveals interesting findings. Although the pandemic does not significantly affect stock market participation, it depresses the proportion of liquid assets invested in risky assets among households who participate in the stock market. This effect persists for up to eight years after the pandemic and is particularly pronounced among households characterized by higher risk aversion and greater income volatility. Analysis conducted using different datasets consistently suggests that the pandemic primarily influences portfolio choices through a shift in risk attitudes.

• Item Type: MPRA Paper
• Language: English
• Keywords: Pandemic, Portfolio Choice, Rational Inattention, Risky Share, Risk Attitude
• Subjects: D - Microeconomics > D1 - Household Behavior and Family Economics > D10 - General; G - Financial Economics > G1 - General Financial Markets > G11 - Portfolio Choice ; Investment Decisions; I - Health, Education, and Welfare > I1 - Health > I10 - General

References

Abadie, Alberto, Susan Athey, Guido W Imbens, and Jeffrey M Wooldridge. 2023. “When should you adjust standard errors for clustering?” Quarterly Journal of Economics 138 (1): 1–35.

Adda, Jérôme. 2016. “Economic activity and the spread of viral diseases: Evidence from high frequency data.” Quarterly Journal of Economics 131 (2): 891–941.

Addoum, Jawad M. 2017. “Household portfolio choice and retirement.” Review of Economics and Statistics 99 (5): 870–883.

Agarwal, Sumit, and Bhashkar Mazumder. 2013. “Cognitive abilities and household financial decision making.” American Economic Journal: Applied Economics 5 (1): 193–207.

Agarwal, Sumit, and Sandeep Varshneya. 2022. “Financial crisis and the U.S. mortgage markets – a review.” Chpt 9, in C. K. Y. Leung ed., Handbook of Real Estate and Macroeconomics, Northampton, M.A., USA.

Agüero, Jorge M, and Trinidad Beleche. 2017. “Health shocks and their long-lasting impact on health behaviors: Evidence from the 2009 H1N1 pandemic in Mexico.” Journal of Health Economics 54:40–55.

Albanesi, Stefania, and Jiyeon Kim. 2021. “Effects of the COVID-19 recession on the US labor market: Occupation, family, and gender.” Journal of Economic Perspectives 35 (3): 3–24.

Almond, Douglas, and Bhashkar Mazumder. 2005. “The 1918 influenza pandemic and subsequent health outcomes: An analysis of SIPP data.” American Economic Review 95 (2): 258–262.

Angerer, Xiaohong, and Pok-Sang Lam. 2009. “Income risk and portfolio choice: An empirical study.” Journal of Finance 64 (2): 1037–1055.

Atella, Vincenzo, Marianna Brunetti, and Nicole Maestas. 2012. “Household portfolio choices, health status and health care systems: A cross-country analysis based on SHARE.” Journal of Banking & Finance 36 (5): 1320–1335.

Attanasio, Orazio, and Luigi Pistaferri. 2014. “Consumption inequality over the last half century: Some evidence using the new PSID consumption measure.” American Economic Review 104 (5): 122–126.

Al-Awadhi, Abdullah M, Khaled Alsaifi, Ahmad Al-Awadhi, and Salah Alhammadi. 2020. “Death and contagious infectious diseases: Impact of the COVID-19 virus on stock market returns.” Journal of Behavioral and Experimental Finance 27:100326.

Benartzi, Shlomo, and Richard H Thaler. 1995. “Myopic loss aversion and the equity premium puzzle.” Quarterly Journal of Economics 110 (1): 73–92.

Betermier, Sebastien, Thomas Jansson, Christine Parlour, and Johan Walden. 2012. “Hedging labor income risk.” Journal of Financial Economics 105 (3): 622–639.

Bogan, Vicki L, and Angela R Fertig. 2013. “Portfolio choice and mental health.” Review of Finance 17 (3): 955–992.

Borghans, Lex, James J Heckman, Bart HH Golsteyn, and Huub Meijers. 2009. “Gender differences in risk aversion and ambiguity aversion.” Journal of the European Economic Association 7 (2-3): 649–658.

Breunig, Christoph, Steffen Huck, Tobias Schmidt, and Georg Weizsäcker. 2021. “The standard portfolio choice problem in Germany.” Economic Journal 131 (638): 2413–2446.

Brunnermeier, Markus K, and Stefan Nagel. 2008. “Do wealth fluctuations generate time-varying risk aversion? Micro-evidence on individuals.” American Economic Review 98 (3): 713–36.

Callaway, Brantly, Andrew Goodman-Bacon, and Pedro HC Sant’Anna. 2024. Difference-in-differences with a continuous treatment. Technical report. National Bureau of Economic Research.

Calvet, Laurent E, John Y Campbell, and Paolo Sodini. 2009. “Fight or flight? Portfolio rebalancing by individual investors.” Quarterly Journal of Economics 124 (1): 301–348.

Cameron, Lisa, and Manisha Shah. 2015. “Risk-taking behavior in the wake of natural disasters.” Journal of Human Resources 50 (2): 484–515.

Campbell, John Y, and Luis M Viceira. 2002. Strategic asset allocation: portfolio choice for longterm investors. Clarendon Lectures in Economics.

Charness, Gary, and Uri Gneezy. 2012. “Strong evidence for gender differences in risk taking.” Journal of Economic Behavior & Organization 83 (1): 50–58.

Chen, Yuting, Patricia Cortes, Gizem Kosar, Jessica Pan, and Basit Zafar. 2023. “The Impact of COVID-19 on Workers’ Expectations and Preferences for Remote Work.” AEA Papers and Proceedings 113:556–561.

Chetty, Raj, John N Friedman, Nathaniel Hendren, Michael Stepner, and The Opportunity Insights Team. 2020. How did COVID-19 and stabilization policies affect spending and employment? A new real-time economic tracker based on private sector data. Vol. 27431. National Bureau of Economic Research Cambridge, MA.

Chetty, Raj, László Sándor, and Adam Szeidl. 2017. “The effect of housing on portfolio choice.” Journal of Finance 72 (3): 1171–1212.

Chiappori, Pierre-André, and Monica Paiella. 2011. “Relative risk aversion is constant: Evidence from panel data.” Journal of the European Economic Association 9 (6): 1021–1052.

Christelis, Dimitris, Tullio Jappelli, and Mario Padula. 2010. “Cognitive abilities and portfolio choice.” European Economic Review 54 (1): 18–38.

Chuang, Yating, and Laura Schechter. 2015. “Stability of experimental and survey measures of risk, time, and social preferences: A review and some new results.” Journal of Development Economics 117:151–170.

Cocco, Joao F. 2005. “Portfolio choice in the presence of housing.” Review of Financial Studies 18 (2): 535–567.

Coibion, Olivier, Yuriy Gorodnichenko, and Michael Weber. 2020. “The cost of the COVID-19 crisis: Lockdowns, macroeconomic expectations, and consumer spending.” National Bureau of Economic Research No. w27141.

Dawood, Fatimah S, A Danielle Iuliano, Carrie Reed, Martin I Meltzer, David K Shay, Po-Yung Cheng, Don Bandaranayake, Robert F Breiman, W Abdullah Brooks, Philippe Buchy, et al. 2012. “Estimated global mortality associated with the first 12 months of 2009 pandemic influenza A H1N1 virus circulation: A modelling study.” Lancet Infectious Diseases 12 (9): 687–695.

Dohmen, Thomas, Hartmut Lehmann, and Norberto Pignatti. 2016. “Time-varying individual risk attitudes over the Great Recession: A comparison of Germany and Ukraine.” Journal of Comparative Economics 44 (1): 182–200.

Downey, Mitch. 2024. “Unit-specific trends lead to biased estimates of average treatment effects in difference-in-differences settings.” Unpublished paper.

Eeckhoudt, Louis, Christian Gollier, and Harris Schlesinger. 1996. “Changes in background risk and risk taking behavior.” Econometrica: 683–689.

Hanaoka, Chie, Hitoshi Shigeoka, and Yasutora Watanabe. 2018. “Do risk preferences change? Evidence from the Great East Japan Earthquake.” American Economic Journal: Applied Economics, 10 (2): 298–330.

Hanspal, Tobin, Annika Weber, and Johannes Wohlfart. 2021. “Exposure to the COVID-19 stock market crash and its effect on household expectations.” Review of Economics and Statistics 103 (5): 994–1010.

Heaton, John, and Deborah Lucas. 2000. “Portfolio choice in the presence of background risk.” Economic Journal 110 (460): 1–26.

Hong, Harrison, Jeffrey D Kubik, and Jeremy C Stein. 2004. “Social interaction and stock-market participation.” Journal of Finance 59 (1): 137–163.

Hurwitz, Abigail, Olivia S Mitchell, and Orly Sade. 2021. “Longevity perceptions and saving decisions during the COVID-19 outbreak: An experimental investigation.” AEA Papers and Proceedings 111:297–301.

Ibuka, Yoko, Gretchen Chapman, Lauren Meyers, Meng Li, and Alison Galvani. 2010. “The dynamics of risk perceptions and precautionary behavior in response to 2009 (H1N1) pandemic influenza.” BMC Infectious Diseases 10:296–307.

Keller, Carmen, and Michael Siegrist. 2006. “Investing in stocks: The influence of financial risk attitude and values-related money and stock market attitudes.” Journal of Economic Psychology, 27 (2): 285–303.

Kelly, Heath, Heidi A Peck, Karen L Laurie, Peng Wu, Hiroshi Nishiura, and Benjamin J Cowling. 2011. “The age-specific cumulative incidence of infection with pandemic influenza H1N1 2009 was similar in various countries prior to vaccination.” PloS One 6 (8): e21828.

Koijen, Ralph SJ, and Motohiro Yogo. 2019. “A demand system approach to asset pricing.” Journal of Political Economy 127 (4): 1475–1515.

Kolstad, Jonathan T, and Amanda E Kowalski. 2012. “The impact of health care reform on hospital and preventive care: Evidence from Massachusetts.” Journal of Public Economics 96 (11-12): 909–929.

Kopelman, Jason, and Harvery Rosen. 2016. “Are Public Sector Jobs Recession-proof? Were They Ever?” Public Finance Review 44:370–396.

Kuhnen, Camelia M, and Brian Knutson. 2011. “The influence of affect on beliefs, preferences, and financial decisions.” Journal of Financial and Quantitative Analysis 46 (3): 605–626.

Kuhnen, Camelia M, Sarah Rudorf, and Bernd Weber. 2017. The effect of prior choices on expectations and subsequent portfolio decisions. Technical report. National Bureau of Economic Research.

Larrimore, Jeff, Jacob Mortenson, and David Splinter. 2022. “Earnings Shocks and Stabilization During COVID-19.” Journal of Public Economics: 104597.

Liang, Pinghan, and Shiqi Guo. 2015. “Social interaction, Internet access and stock market participation–An empirical study in China.” Journal of Comparative Economics 43 (4): 883–901.

Maćkowiak, Bartosz, Filip Matějka, and Mirko Wiederholt. 2023. “Rational Inattention: A Review.” Journal of Economic Literature 61:226–273.

Malmendier, Ulrike, and Stefan Nagel. 2011. “Depression babies: Do macroeconomic experiences affect risk taking?” Quarterly Journal of Economics 126 (1): 373–416.

Miao, Jianjun, Jieran Wu, and Eric Young. 2022. “Multivariate Rational Inattention.” Econometrica 90:907–945.

Palia, Darius, Yaxuan Qi, and Yangru Wu. 2014. “Heterogeneous background risks and portfolio choice: Evidence from micro-level data.” Journal of Money, Credit and Banking 46 (8): 1687– 1720.

Philipson, Tomas. 2000. “Economic epidemiology and infectious diseases.” Handbook of Health Economics 1:1761–1799.

Piskorski, Tomasz, and Amit Seru. 2021. “Debt relief and slow recovery: A decade after Lehman.” Journal of Financial Economics 141:1036–1059.

Pool, Veronika K, Noah Stoffman, Scott E Yonker, and Hanjiang Zhang. 2019. “Do shocks to personal wealth affect risk-taking in delegated portfolios?” Review of Financial Studies 32 (4): 1457–1493.

Rasul, Imran. 2020. “The economics of viral outbreaks.” AEA Papers and Proceedings 110:265–68.

Restrepo, Brandon J, and Eliana Zeballos. 2020. “The effect of working from home on major time allocations with a focus on food-related activities.” Review of Economics of the Household 18 (4): 1165–1187.

Rubinstein, Yona, and Ross Levine. 2020. “Selection into entrepreneurship and self-employment.” CEP Discussion Papers (CEPDP1722). London School of Economics and Political Science. Centre for Economic Performance, London, UK. https://eprints.lse.ac.uk/108462/1/dp1722.pdf Accessed on 2024-01-03.

Schildberg-Hörisch, Hannah. 2018. “Are risk preferences stable?” Journal of Economic Perspectives 32 (2): 135–154.

Shachat, Jason, Matthew J Walker, and Lijia Wei. 2021. “How the onset of the Covid-19 pandemic impacted pro-social behaviour and individual preferences: Experimental evidence from China.” Journal of Economic Behavior & Organization 190:480–494.

Shrestha, Sundar S, David L Swerdlow, Rebekah H Borse, Vimalanand S Prabhu, Lyn Finelli, Charisma Y Atkins, Kwame Owusu-Edusei, Beth Bell, Paul S Mead, Matthew Biggerstaff, et al. 2011. “Estimating the burden of 2009 pandemic influenza A (H1N1) in the United States (April 2009–April 2010).” Clinical Infectious Diseases 52 (suppl_1): S75–S82.

Sims, Christopher. 2003. “Implications of Rational Inattention.” Journal of Monetary Economics, 50:665–90.

Spaenjers, Christophe, and Sven Michael Spira. 2015. “Subjective life horizon and portfolio choice.” Journal of Economic Behavior & Organization 116:94–106.

Taubenberger, Jeffery K, and David M Morens. 2006. “1918 Influenza: The mother of all pandemics.” Revista Biomedica 17 (1): 69–79.