This paper investigates whether changes in Generally Accepted Accounting Principles (GAAP) affect corporate investment decisions. Using a sample containing forty nine changes in GAAP, I find that changes in accounting rules affect investment decisions. I then examine two mechanisms through which changes in GAAP affect investment. First, I find that changes in GAAP affect investment, particularly R&D expenditures, when firms have financial covenants that are affected by changes in GAAP. Second, I find evidence suggesting that the process of complying with some changes in GAAP alters managers’ information sets and consequently changes their investment decisions, particularly their capital and R&D expenditures and, to a weaker extent, their acquistion expenditures. This paper contributes to the literature on the real effects of accounting by providing evidence that accounting rules affect investment decisions even when the rule change does not concern the measurement and reporting of investment, and by documenting specific mechanisms through which the relation manifests.

We examine whether auditor regulatory oversight affects the value of financial statement audits. Using the PCAOB international inspection program as a setting to generate within country variation in regulatory oversight, we find that non-U.S. auditors inspected by the PCAOB gain 4% to 6% market share from competing auditors after PCAOB inspection reports are made public. When inspection findings reveal that an auditor has many engagement-level deficiencies, market share gains following inspection reports are significantly smaller. Our evidence suggests that regulatory scrutiny increases the assurance value of an audit and highlights the role of public regulatory oversight in the audit market.

We survey companies and find that many use incorrect tax rate inputs into important corporate decisions. Specifically, many companies use an average tax rate (the GAAP effective tax rate, ETR) to evaluate incremental decisions, rather than using the theoretically correct marginal tax rate. We find evidence consistent with behavioral biases (heuristics, salience) and managers' educational backgrounds affecting these choices. We estimate the economic consequences of using the theoretically incorrect tax rate and find that using the ETR for capital structure decisions leads to suboptimal leverage choices and using the ETR in investment decisions makes firms less responsive to investment opportunities.

This paper examines whether and when the information environment of peer firms in an industry affects the cost of capital for other firms in the industry. We predict and find that the peer information environment is negatively associated with a firm's cost of capital when there is less publicly available firm-specific information and this negative association shrinks as the amount of firm-specific information increases. This paper provides evidence that information about peer-firms has externalities on the cost of capital for related firms and that these externalities are time-varying.

We survey companies and find that many use incorrect tax rate inputs into important corporate decisions. Specifically, many companies use an average tax rate (the GAAP effective tax rate, ETR) to evaluate incremental decisions, rather than using the theoretically correct marginal tax rate. We find evidence consistent with behavioral biases (heuristics, salience) and managers' educational backgrounds affecting these choices. We estimate the economic consequences of using the theoretically incorrect tax rate and find that using the ETR for capital structure decisions leads to suboptimal leverage choices and using the ETR in investment decisions makes firms less responsive to investment opportunities.