We investigate company additions to stock market indices over a six-year period in 39 developed and emerging markets around the world. For most markets, we find a post-inclusion increase in beta and an increase in the explanatory power of market returns (R2), reflecting increased comovement after inclusion between the added stock and rest of the index. In addition, for most markets there is a post-inclusion increase in stock turnover. These inclusion effects increase over time, tend to be stronger when the index is dispersed (i.e., includes many stocks), and in “common law” countries. These patterns appear to be inconsistent with the view that stock returns are generated by fundamentals only and are consistent with the category/habitat view of Barberis, Shleifer and Wurgler (2005). In line with this interpretation, we present evidence that the post-inclusion increase in comovement is positively correlated with the presence of index-oriented institutional investors in the market. We also present tentative evidence suggesting that, in less developed markets, the post-inclusion increase in comovement is related to information problems.
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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number
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References listed on IDEAS Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
Rafael Porta & Florencio Lopez-De-Silanes & Andrei Shleifer, 2006.
"What Works in Securities Laws?,"
Journal of Finance,
American Finance Association, vol. 61(1), pages 1-32, 02.
[Downloadable!] (restricted)
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Rafael La Porta & Florencio Lopez-de-Silane & Andrei Shleifer, 2003.
"What Works in Securities Law?,"
NBER Working Papers
9882, National Bureau of Economic Research, Inc.
[Downloadable!] (restricted)
Barberis, Nicholas & Shleifer, Andrei, 2003.
"Style investing,"
Journal of Financial Economics,
Elsevier, vol. 68(2), pages 161-199, May.
[Downloadable!] (restricted)
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Nicholas Barberis & Andrei Shleifer, 2000.
"Style Investing,"
NBER Working Papers
8039, National Bureau of Economic Research, Inc.
[Downloadable!] (restricted)
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