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Lot Size Constraints and Market Quality: Evidence from the Borsa Italiana

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  • Arie E. Gozluklu
  • Pietro Perotti
  • Barbara Rindi
  • Roberta Fredella

Abstract

type="main"> Trading venues often impose a minimum lot size (minimum trade unit [MTU]) to facilitate order execution. We document changes in market quality associated with the reduction of the MTU to one share on the Italian stock exchange, the Borsa Italiana. We observe a substantial improvement in liquidity, with an average decrease in the relative spread of 10.2%, and more significant improvements for those firms for which the MTU constraint was more binding. We also show that the improvement in liquidity is mainly driven by a reduction in adverse selection; that informational efficiency is not significantly affected; and there is an increase in retail trading. We interpret our findings in light of a model of asymmetric information in which the MTU affects traders’ choice of order size.

Suggested Citation

  • Arie E. Gozluklu & Pietro Perotti & Barbara Rindi & Roberta Fredella, 2015. "Lot Size Constraints and Market Quality: Evidence from the Borsa Italiana," Financial Management, Financial Management Association International, vol. 44(4), pages 905-945, October.
    • Handle: RePEc:bla:finmgt:v:44:y:2015:i:4:p:905-945
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    2. Thanos Verousis & Pietro Perotti & Georgios Sermpinis, 2018. "One size fits all? High frequency trading, tick size changes and the implications for exchanges: market quality and market structure considerations," Review of Quantitative Finance and Accounting, Springer, vol. 50(2), pages 353-392, February.
    3. Nor Elliany Hawa Ibrahim & Kamarun Nisham Taufil Mohd & Karren Lee-Hwei Khaw, 2019. "Effect of Standardization of Trading Board Lot on Abnormal Liquidity in Malaysian Stock Market," Capital Markets Review, Malaysian Finance Association, vol. 27(2), pages 89-102.
    4. Anirban Banerjee & Ashok Banerjee, 2020. "Does trade size restriction affect trading behavior? Evidence from Indian single stock futures market," Journal of Futures Markets, John Wiley & Sons, Ltd., vol. 40(3), pages 355-373, March.

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