JFE

Banz, R. W. (1981). "The relationship between return and market value of common stocks." Journal of Financial Economics 9(1): 3-18.
    This study examines the empirical relationship between the return and the total market value of NYSE common stocks. It is found that smaller firms have had higher risk adjusted returns, on average, than larger firms. This ‘size effect’ has been in existence for at least forty years and is evidence that the capital asset pricing model is misspecified. The size effect is not linear in the market value; the main effect occurs for very small firms while there is little difference in return between average sized and large firms. It is not known whether size per se is responsible for the effect or whether size is just a proxy for one or more true unknown factors correlated with size.



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http://www.sciencedirect.com/science/article/pii/0304405X81900180

The relationship between return and market value of common stocks