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Do Investors Buy What They Know? Product Market Choices and Investment Decisions

Matti Keloharju1; Samuli Knüpfer2; Juhani T. Linnainmaa3

1 Aalto University · 2 London Business School · 3 University of Chicago

Review of Financial Studies 2012

This article shows that individuals' product market choices influence their investment decisions. Using microdata from the brokerage and automotive industries, we find a strong positive relation between customer relationship, ownership of a company, and size of the ownership stake. Investors are also more likely to purchase and less likely to sell shares of companies they frequent as customers. These effects are stronger for individuals with longer customer relationships. A merger-based natural experiment supports a causal interpretation of our results. We also find evidence of causality in the other direction: inheritances and gifts have an effect on individuals' patronage decisions. A setup in which customer-investors regard stocks as consumption goods, not just as investments, seems to best explain our results. (JEL G11, G24, D83) The Author 2012. Published by Oxford University Press on behalf of The Society for Financial Studies. All rights reserved. For Permissions, please e-mail: [email protected]., Oxford University Press.

DOI
10.1093/rfs/hhs090
Volume
25 (10)
Pages
2921-2958
Language
en
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Sources
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