NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Mixing Family With Business: A Study of Thai Business Groups and the Families Behind Them

Marianne Bertrand, Simon Johnson, Krislert Samphantharak, Antoinette Schoar

NBER Working Paper No. 13738
Issued in January 2008
NBER Program(s):   CF

Families run a large fraction of business groups around the world. In this paper, we analyze how the structure of the families behind these business groups affects the groups' organization, governance and performance. To address this question, we constructed a unique data set of family trees and business groups for nearly 100 of the largest business families in Thailand. We find a strong positive association between family size and family involvement in the ownership and control of the family business. The sons of the founders play a central role in both ownership and board membership, especially when the founder of the group is gone. The availability of more sons is also associated with lower firm-level performance, especially when the founder is no longer present. We identify a possible governance channel for this performance effect. Excess control by sons, but not other family members, is associated with lower firm performance. In addition, excess control by sons increases with the number of sons and with the death of the founder. One hypothesis that emerges from our analysis is that part of the decay of family-run groups over time may be due to a dilution of ownership and control across a set of equally powerful descendants of the founder, which creates a race to the bottom in tunneling resources out of the group firms.

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Document Object Identifier (DOI): 10.3386/w13738

Published: Bertrand, Marianne & Johnson, Simon & Samphantharak, Krislert & Schoar, Antoinette, 2008. "Mixing family with business: A study of Thai business groups and the families behind them," Journal of Financial Economics, Elsevier, vol. 88(3), pages 466-498, June. citation courtesy of

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