We provide an empirical examination of the determinants of corporate debt maturity. Our evidence offers strong support for the contracting‐cost hypothesis. Firms that have few growth options, are large, or are regulated have more long‐term debt in their capital structure. We find little evidence that firms use the maturity structure of their debt to signal information to the market. The evidence is consistent, however, with the hypothesis that firms with larger information asymmetries issue more short‐term debt. We find no evidence that taxes affect debt maturity.

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We examine the effects of trading after hours on the amount and timing of price discovery over the 24-hour day. A high volume of liquidity trade facilitates price discovery. Thus prices are more efficient and more information is revealed per hour during the trading day than after hours. However, the low trading volume after hours generates significant, albeit inefficient, price discovery. Individual trades contain more information after hours than during the day. Because information asymmetry declines over the day, price changes are larger, reflect more private information, and are less noisy before the open than after the close. We thank Maureen O'Hara (the editor), an anonymous referee,

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This paper explores the competition between two trading venues, Electronic Communication Networks (ECNs) and Nasdaq market makers. ECNs o¡er the advantages of anonymity and speed of execution, which attract informed traders. Thus, trades are more likely to occur on ECNs when information asymmetry is greater and when trading volume and stock-return volatility are high. ECN trades have greater permanent price impacts and more private information is revealed through ECN trades than though market-maker trades. However, ECN trades have higher ex ante trading costs because market makers can preference or internalize the less informed trades and o¡er them better executions.TECHNOLOGICAL INNOVATIONS THAT ENABLE HIGH-SPEED, low-cost electronic trading systems are dramatically changing the structure of ¢nancial markets. Exchanges and markets around the world are merging or forming alliances to improve liquidity and reduce costs in the face of increased competition from each other and from these computerized trading systems. Trading volume on Electronic Communications Networks (ECNs) has grown rapidly over the past several years. ECNs are now involved in more than a third of Nasdaq trading volume and are attempting to increase their market share in NYSE-listed