A global trend towards automated trading systems raises the important question of whether execution costs are, in fact, lower than on trading floors. This paper compares the trade execution costs of similar stocks in an automated trading structure (Paris Bourse) and a floor‐based trading structure (NYSE). Results indicate that execution costs are higher in Paris than in New York after controlling for differences in adverse selection, relative tick size, and economic attributes across samples. These results suggest that the present form of the automated trading system may not be able to fully replicate the benefits of human intermediation on a trading floor.

We study trading costs and dealer behavior in U.S. corporate bond markets from 2006 to 2016. Despite a temporary spike during the financial crisis, average trade execution costs have not increased notably over time. However, dealer capital commitment, turnover, block trade frequency, and average trade size decreased during the financial crisis and thereafter. These declines are attributable to bank‐affiliated dealers, as nonbank dealers have increased their market commitment. Our evidence indicates that liquidity provision in the corporate bond markets is evolving away from the commitment of bank‐affiliated dealer capital to absorb customer imbalances, and that postcrisis banking regulations likely contribute.

Dealer quotes in corporate bonds, though indicative, lower trading costs and increase trading volume. Dealers offering higher quality quotes attract more order flow and execute trades at favorable prices. Dealers advertise quotes to manage their inventories and attract orders from nonrelationship clients. However, quote competition is imperfect. The best quotes often fail to attract orders, and trade‐throughs are common. Nevertheless, quote competition is important as clients exploit quotes from other dealers in negotiations, forcing dealers with lower quality quotes to offer price improvements. Quoting is not a zero‐sum game, as more active bond‐level quoting leads to more bond‐level trading.