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Windfall gains and stock market participation: Evidence from shopping receipt lottery

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  • Cheng, Tzu-Chang Forrest
  • Huang, Hsuan-Hua
  • Lin, Tse-Chun
  • Yang, Tzu-Ting
  • Zhu, Jian-Da

Abstract

This paper utilizes receipt lotteries in Taiwan, along with comprehensive administrative data, to examine the effect of cash windfalls on stock market participation and portfolio diversification, which can help us understand whether wealth levels serve as the explanation for the limited participation and under-diversification puzzles in stock markets. The results indicate that each million TWD (approximately 33,000 USD) windfall gain from winning receipt lotteries increases the probability of stock market participation by 1.09 percentage points. This effect is primarily driven by individuals who were not participating in the stock market prior to winning. For existing participants, each million TWD windfall increases the total value of stocks by 142,552 TWD, attributed to both an increase in their number of shares and higher average prices of the stocks they hold. Additionally, we find that individuals do not significantly diversify their portfolios after winning the lottery, suggesting that wealth level is not the primary reason for under-diversification.

Suggested Citation

  • Cheng, Tzu-Chang Forrest & Huang, Hsuan-Hua & Lin, Tse-Chun & Yang, Tzu-Ting & Zhu, Jian-Da, 2025. "Windfall gains and stock market participation: Evidence from shopping receipt lottery," Journal of Banking & Finance, Elsevier, vol. 172(C).
    • Handle: RePEc:eee:jbfina:v:172:y:2025:i:c:s0378426624002929
    DOI: 10.1016/j.jbankfin.2024.107378
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    JEL classification:

    • D10 - Microeconomics - - Household Behavior - - - General
    • D81 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Criteria for Decision-Making under Risk and Uncertainty
    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates

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