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Heterogeneous attention and twin stock anomaly: A natural experiment from the daily price limit rule

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  • Ren, Honglin
  • Gai, Zhen
  • Wang, Chongjun
  • Xu, Nianhang

Abstract

We examine whether variations in cross-market differences in investor attention drives price disparities in twin stocks. In the Chinese A-share market, price limit rules and rounded return rankings create exogenous variations in investor attention. Using these natural experiments, we show that A-H shares receiving greater attention in the A-share market exhibit a greater price premium following limit-up events. This effect is weaker for stocks with less ex-ante attention disparities across markets and during market-wide distractions. Using internet search volumes, we find that attention disparity explains 3.30% to 7.95% of the daily variations in the A-H price premium. Our findings highlight the role of investor attention in pricing twin stocks.

Suggested Citation

  • Ren, Honglin & Gai, Zhen & Wang, Chongjun & Xu, Nianhang, 2026. "Heterogeneous attention and twin stock anomaly: A natural experiment from the daily price limit rule," Journal of Banking & Finance, Elsevier, vol. 189(C).
  • Handle: RePEc:eee:jbfina:v:189:y:2026:i:c:s0378426626001172
    DOI: 10.1016/j.jbankfin.2026.107743
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