A Modern Approach to the Efficient-Market Hypothesis
AbstractMarket efficiency at least requires the absence of weak arbitrage opportunities, but this is not sufficient to establish a situation where the market is sensitive, i.e., where it "fully reflects" or "rapidly adjusts to" some information flow including the evolution of asset prices. By contrast, No Weak Arbitrage together with market sensitivity is sufficient and necessary for a market to be informationally efficient.
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Date of creation: Feb 2013
Date of revision: Mar 2014
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