The New Stock Market: Sense and Nonsense

How stocks are traded in the United States has been totally transformed. Gone are the dealers on NASDAQ and the specialists at the NYSE. Instead, a company’s stock can now be traded on up to sixty competing venues where a computer matches incoming orders. High-frequency traders (HFTs) post the majority of quotes and are the preponderant source of liquidity in the new market. Many practices associated with the new stock market are highly controversial, as illustrated by the public furor following the publication of Michael Lewis’s book Flash Boys. Critics say that HFTs use their speed in discovering changes in the market and in altering their orders to take advantage of other traders. Dark pools – off-exchange trading venues that promise to keep the orders sent to them secret and to restrict the parties allowed to trade – are accused of operating in ways that injure many traders. Brokers are said to mishandle customer orders in an effort to maximize the payments they receive for sending trading venues their customers’ orders, rather than delivering best execution. In this Article, we set out a simple, but powerful, conceptual framework for analyzing the new stock market. The framework is built upon three basic concepts: adverse selection, the principal-agent problem, and a multivenue trading system. We illustrate the utility of this framework by analyzing the new market’s eight most controversial practices. The effects of each practice are evaluated in terms of the multiple social goals served by equity-trading markets. We ultimately conclude that there is no emergency requiring immediate, poorly considered action. Some reforms proposed by critics, however, are clearly desirable. Other proposed reforms involve a trade-off between two or more valuable social goals. In these cases, whether a reform is desirable may be unclear, but a better understanding of the trade-off involved enables a more informed choice and suggests areas in which further empirical research would be useful. Finally, still other proposed reforms are based on misunderstandings of the market or of the social impacts of a practice and should be avoided

SIZE AND HETEROGENEITY MATTER. A MICROSTRUCTURE-BASED ANALYSIS OF REGULATION OF SECONDARY MARKETS FOR GOVERNMENT BONDS.

This paper deals with the economics of secondary markets for government bonds. Ultimately, the analysis is shaped by a public policy goal: assessing the elements of a regulatory framework for these markets. In that regard, the decisive role of market structure leads to a critical review of microstructure conclusions relevant specifically for government debt markets. It is argued that the nature of information asymmetries and matching costs in government debt markets determines a bias towards a fragmented microstructure at odds both with exchange-like arrangements and with ordinary regulatory approaches. Hence, a generic conclusion highlights the risks of blindly transposing regulatory principles from the equity markets area without due regard to the specifics of the bond market. As a specific application of this idea, the paper critically reviews electronic trading platforms that emulate exchange-like order execution solutions. More specifically, the paper opposes the hybrid microstructure (pure limit order book plus affirmative quoting obligation) faced by European primary dealers and the arbitrage-based approach to market-making found in US inter-dealer markets. The Citigroup disruptive trade in August 2004 is analyzed from this perspective. Government bond regulation is argued to necessarily depart from ordinary approaches also because it captures the diverse interests of various governmental agencies. As an application of this principle, the paper discusses repo and short-selling regulation in government bond markets. The atypical market structure and the multi- agency endeavour around government bond markets raise the chances of regulatory failures. Nevertheless, it is argued that a reliance on competition, integrative infrastructure and basic systemic protections as over-arching principles for regulation is consistent with recommendations from relevant economic theory. Finally, political economy issues arising in implementation of transparency, disclosure or retail investor protection will be addressed in the context of selected country cases.government bonds, microstructure, regulation

Algorithmic and High-Frequency Trading Strategies: A Literature Review

The advances in computer and communication technologies have created new opportunities for improving, extending the application of or even developing new trading strategies. Transformations have been observed both at the level of investment decisions, as well as at the order execution layer. This review paper describes how traditional market participants, such as market-makers and order anticipators, have been reshaped and how new trading techniques relying on ultra-low-latency competitive advantage, such as electronic \front running", function. Also, the natural con ict between liquidity-consumers and liquidity-suppliers has been taken to another level, due to the proliferation of algorithmic trading and electronic liquidity provision strategies

The industrial organization of execution, clearing and settlement in financial markets

The execution, clearing, and settlement of financial transactions are all subject to substantial scale and scope economies which make each of these complementary functions a natural monopoly. Integration of trade, execution, and settlement in an exchange improves efficiency by economizing on transactions costs. When scope economies in clearing are more extensive than those in execution, integration is more costly, and efficient organization involves a trade-off of scope economies and transactions costs. A properly organized clearing cooperative can eliminate double marginalization problems and exploit scope economies, but can result in opportunism and underinvestment. Moreover, a clearing cooperative may exercise market power. Vertical integration and tying can foreclose entry, but foreclosure can be efficient because market power rents attract excessive entry. Integration of trading and post-trade services is the modal form of organization in financial markets, which is consistent with the hypothesis that transactional efficiencies explain organizational arrangements in these markets