This paper develops and analyzes a model in which tax considerations and financial reporting considerations have countervailing effects on a firm's investments in internally developed intangible assets. It also proposes and estimates a new measure of tax preferences, which we call the economic effective tax rate. This measure reflects both investments in intangible assets and the use of debt financing, neither of which generates a book-tax difference. Our measure indicates that the economic effective tax rate was about 18 percent between 1988 and 2005, when the statutory tax rate was either 34 or 35 percent.

We develop a positive theory of accounting standards when standards generate network externalities and differ in the amount of reporting discretion, or flexibility, they provide firms. We evaluate expected value-maximizing firms’ preferences between two standards regimes, rigid and flexible, as the number of firms subject to each standard varies, as the organization of the securities market varies, and as the mapping from the underlying economics of the firms’ transactions to the accounting reports produced under the two standards vary. We also compare firms’ preferences between the two regimes to the preferences of profit-maximizing traders in the firms’ securities.

This paper tests the hypothesis that negative client stock returns following the revelation that Enron documents had been shredded are attributable to confounding effects as opposed to a loss of Andersen's reputation. We find that a sharp decline in oil prices along with differences in the industry composition of the Andersen and Big 4 client portfolios combine to produce significantly more negative returns for Andersen clients relative to Big 4 clients, and for Andersen's Houston office clients relative to its clients in other locations. The market reaction to two other Enron-related events also offers little support for a reputation effect.