Schultz, P. (1983). "Transaction costs and the small firm effect: A comment." Journal of Financial Economics 12(1): 81-88.
Stoll and Whaley (1983) suggest large transaction costs may be responsible for the large risk-adjusted returns earned by small firm stocks. This study, using data from the AMEX as well as the NYSE, shows that investors can earn risk-adjusted excess returns after transaction costs by holding small firms for relatively short holding periods. Other literature that provides evidence that is inconsistent with the transaction costs hypothesis is cited.
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http://www.sciencedirect.com/science/article/pii/0304405X83900284