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Testing efficiency in small and large financial markets

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  • Dare, Wale

Abstract

We investigate practical tests of market efficiency that are not subject to the joint-hypothesis problem inherent in tests that require the specification of an equilibrium model of asset prices. The methodology we propose simplifies the testing procedure considerably by reframing the market efficiency question into one about the existence of a local martingale measure. As a consequence, the need to directly verify the no dominance condition is completely avoided. We also investigate market efficiency in the large financial market setting with the introduction of notions of asymptotic no dominance and market efficiency that remain consistent with the small market theory. We obtain a change of numeraire characterization of asymptotic market efficiency and suggest empirical tests of inefficiency in large financial markets.

Suggested Citation

  • Dare, Wale, 2017. "Testing efficiency in small and large financial markets," Economics Working Paper Series 1714, University of St. Gallen, School of Economics and Political Science.
    • Handle: RePEc:usg:econwp:2017:14
    as

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    References listed on IDEAS

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    More about this item

    Keywords

    Market efficiency; semimartingale; large financial markets; local martingale measure; asymptotic arbitrage;
    All these keywords.

    JEL classification:

    • C12 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods and Methodology: General - - - Hypothesis Testing: General
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading

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