We study the microstructure of the Pink Sheets and assess the ability of existing theory to capture salient features of this relatively unstructured and unregulated market. Clustering patterns in quotes, quoted spreads, and trade prices indicate that market participants have selected...

This paper chronicles the research that led to the conclusion that Nasdaq marketmakers implicitly colluded to maintain supracompetitive spreads (Christie and Schultz, 1994). The paper provides a brief description of the differences between a dealer and an auction market, and highlights the...

Using electronic order flow data for a sample of NYSE-listed stocks, we examine the relative importance of program traders, institutional traders, retail traders, and exchange members in driving commonality in order flow, returns, and liquidity. Using principal components analysis, we find that...

Though trading halts are a common feature in securities markets, the issues associated with the coordination of these halts across markets are not well understood. In fact, regulations often allow traders to circumvent trading halts through the use of alternative venues. Using a sample of order...