We show that both the quoted and effective spreads increased, the quoted depth decreased, and the market quality index decreased after the implementation of Regulation NMS (Reg NMS). We also find an increase in the price impact of trades and the dispersion of the pricing error after Reg NMS. The...

We examine execution costs and quote clustering on the NYSE and NASDAQ using 517 matching pairs of stocks after decimalization. We find that the mean spread of NASDAQ stocks is greater than the mean spread of NYSE stocks when spreads are equally weighted across stocks and the difference is...

This study compares the components of the bid-ask spread estimated from quotes that reflect the trading interest of specialists with those estimated from limit-order quotes and all available quotes for a sample of NYSE stocks. The results show that the adverse selection component of the spread...

We examine execution costs and quote clustering on the NYSE and NASDAQ using 517 matching pairs of stocks after decimalization. We find that the mean spread of NASDAQ stocks is greater than the mean spread of NYSE stocks when spreads are equally weighted across stocks and the difference is...

In this paper, we determine whether each bid (ask) quote reflects the trading interest of the specialist, limit order traders, or both for a sample of NYSE stocks in 1991. We then compare Nasdaq spreads with NYSE spreads that reflect the trading interest of the specialist. Our empirical results...

Using limit order books across all U.S. exchanges, we show that while liquidity for small orders (e.g., the quoted and effective spreads) decreases, liquidity for large orders (e.g., the cumulative depth and the price impact of multiple trades) improves after the implementation of the Tick Size...

This paper provides a review of the literature on high-frequency trading and discusses various initiatives taken by regulatory authorities around the world to address its potential detrimental effects on market quality and investor welfare. Empirical evidence to date generally suggests that...

This paper explores the role of pre-opening price signals in price discovery and liquidity. NYSE Rule 48 suspends the responsibility of designated market makers for disseminating pre-opening price indications in the event of extreme market-wide volatility. Rule 48 speeds up the opening of stocks...

This paper examines whether larger tick sizes improve or hinder price efficiency using data from implementing and terminating the Tick Size Pilot Program (TSP). We show that the TSP led to increases in various liquidity measures, and its termination restored them to their pre-TSP levels. We also...

In this study we analyze dealer exit, survival, and competitive equilibrium in the NASDAQ Stock Market using data from a unique time period that entails major changes in regulatory and competitive environments. We decompose the forces that affect dealer survival into market factors and dealer...