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Equity Market Structure Regulation: Time To Start Over, Paul G. Mahoney

Michigan Business & Entrepreneurial Law Review

Over the past half-century, the U.S. Securities and Exchange Commission (SEC)’s regulations have become key determinants of the way in which stocks trade and the fees that exchanges charge for their services. The current equity market structure rules are contained primarily in the SEC’s Regulation NMS. The theory behind Regulation NMS is that a system of dispersed markets operating pursuant to SEC-mandated information and order routing links will provide the benefits of consolidation and competition simultaneously.

This article argues that Regulation NMS has failed in that quest. It has produced fragmented markets and created questionable incentives for market participants, possibly …