Additions to Market Indices and the Comovement of Stock Returns around the World
AbstractWe 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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Bibliographic InfoPaper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number 7052.
Date of creation: Nov 2008
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Other versions of this item:
- Yishay Yafeh & Stijn Claessens, 2011. "Additions to Market Indices and the Comovement of Stock Returns Around the World," IMF Working Papers 11/47, International Monetary Fund.
- G10 - Financial Economics - - General Financial Markets - - - General (includes Measurement and Data)
- G15 - Financial Economics - - General Financial Markets - - - International Financial Markets
This paper has been announced in the following NEP Reports:
- NEP-ALL-2009-02-28 (All new papers)
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