02423cam a22002297 4500001000600000003000500006005001700011008004100028100002300069245011100092260006600203490004100269500001800310520150500328530006101833538007201894538003601966710004202002830007602044856003702120856003602157w0565NBER20190818211621.0190818s1980 mau||||fs|||| 000 0 eng d1 aShiller, Robert J.14aThe Use of Volatility Measures in Assessing Market Efficiencyh[electronic resource] /cRobert J. Shiller. aCambridge, Mass.bNational Bureau of Economic Researchc1980.1 aNBER working paper seriesvno. w0565 aOctober 1980.3 aMy initial motivation for considering volatility measures in the efficient markets models was to clarify the basic smoothing properties of the models to allow an understanding of the assumptions which are implicit in the notion of market efficiency. The efficient markets models, which are described in section II below ,relate a price today to the expected present value of a path of future variables. Since present values are long weighted moving averages, it would seem that price data should be very stable and smooth. These impressions can be formalized in terms of inequalities describing certain variances (section III). The results ought to be of interest whether or not the data satisfy these inequalities, and the procedures ought not to be regarded as just "another test" of market efficiency. Our confidence of our understanding of empirical phenomena is enhanced when we learn how such an obvious property of data as its "smoothness" relates to the model, and to alternative models (section IV below).On further examination of the volatility inequalities, it became clear that the inequalities may also suggest formal tests of market efficiency that have distinct advantages over conventional tests. These advantages take the form of greater power in certain circumstances of robustness to data errors such as misalignment and of simplicity and understandability. An interpretation of volatility tests versus regression tests in terms of the likelihood principle is offered in section V. aHardcopy version available to institutional subscribers. aSystem requirements: Adobe [Acrobat] Reader required for PDF files. aMode of access: World Wide Web.2 aNational Bureau of Economic Research. 0aWorking Paper Series (National Bureau of Economic Research)vno. w0565.4 uhttp://www.nber.org/papers/w056541uhttp://dx.doi.org/10.3386/w0565