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Tracking Biased Weights: Asset Pricing Implications of Value-Weighted Indexing

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  • Vayanos, Dimitri
  • Jiang, Hao
  • Zheng, Lu

Abstract

We show theoretically and empirically that flows into index funds raise the prices of large stocks in the index disproportionately more than the prices of small stocks. Conversely, flows predict a high future return of the small-minus-large index portfolio. This finding runs counter to the CAPM, and arises when noise traders distort prices, biasing index weights. When funds tracking value-weighted indices experience inflows, they buy mainly stocks in high noise-trader demand, exacerbating the distortion. During our sample period 2000-2019, a small-minus-large portfolio of S&P500 stocks earns ten percent per year, while no size effect exists for non-index stocks.

Suggested Citation

  • Vayanos, Dimitri & Jiang, Hao & Zheng, Lu, 2020. "Tracking Biased Weights: Asset Pricing Implications of Value-Weighted Indexing," CEPR Discussion Papers 15563, C.E.P.R. Discussion Papers.
  • Handle: RePEc:cpr:ceprdp:15563
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    More about this item

    Keywords

    Market efficiency; Mutual funds; Indexing; Limits of arbitrage;
    All these keywords.

    JEL classification:

    • G10 - Financial Economics - - General Financial Markets - - - General (includes Measurement and Data)
    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • G23 - Financial Economics - - Financial Institutions and Services - - - Non-bank Financial Institutions; Financial Instruments; Institutional Investors

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