Is it Efficient to Impose Costs on Small-Volume Equity Traders?

A securities market that imposes higher trading costs on small-volume traders may reduce free-riding on information generated by large-volume traders. The reduction in free-riding increases the probability that large-volume traders will invest in socially beneficial information and engage in costly monitoring of managers of firms in their portfolio.V arious mechanisms can be used to impose costs on small-volume traders.We argue that Nasdaq's former treatment of limit orders was one such mechanism. Depending on the market's structure and the nature of the securities traded in the market, a reduction in freeriding activity may improve overall market efficiency despite a potentially negative impact on information dissemination.