Published online by Cambridge University Press: 09 July 2009
Introduction
This chapter examines some of the basic issues relating to the theory of information efficiency in financial markets and, in particular, some of the definitions and distinctions which have influenced the academic literature to date. Various empirical tests of information efficiency are then reviewed and assessed.
Section 1.2 outlines the concept of information efficiency and traces the development of the terms, definitions and meanings associated with this idea. Sections 1.3, 1.4 and 1.5 review the methods which have been applied to test for the existence of information efficiency, as variously defined, in financial markets.
The ‘efficient markets hypothesis’
In this section, a review is undertaken of the literature which has investigated the concept and existence of information efficiency in financial markets, and in particular the role and relevance of the ‘efficient markets hypothesis’ in our understanding of the operation of these markets.
The efficient markets hypothesis: reviewing the development of an idea
The concept of information efficiency in a market is contained in the so-called ‘efficient markets hypothesis’, a standard definition of which can be found in Fama (1991): ‘I take the market efficiency hypothesis to be the simple statement that security prices fully reflect all available information’ (1991: 1575).
The origin of the ideas central to this hypothesis can be traced back to pioneering work undertaken by Bachelier (1900) into the dynamics of stock price behaviour.
To save this book to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.