We provide new evidence on the relation between option-based compensation and risk-taking behavior by exploiting the change in the accounting treatment of stock options following the adoption of FAS 123R in 2005. The implementation of FAS 123R represents an exogenous change in the accounting benefits of stock options that has no effect on the economic costs and benefits of options for providing managerial incentives. Our results do not support the view that the convexity inherent in option-based compensation is used to reduce risk-related agency problems between managers and shareholders. We show that all firms dramatically reduce their usage of stock options (convexity) after the adoption of FAS 123R and that the decline in option use is strongly associated with a proxy for accounting costs. Little evidence exists that the decline in option usage following the accounting change results in less risky investment and financial policies.

This paper presents a parsimonious, structural model that isolates primary economic determinants of the level and dispersion of managerial ownership, firm scale, and performance and the empirical associations among them. In particular, variation across firms and through time of estimated productivity parameters for physical assets and managerial input and corresponding variation in optimal compensation contract and firm size combine to deliver the well-known hump-shaped relation between Tobin's Q and managerial ownership. To assess the effectiveness of standard econometric approaches to the endogeneity problem, we apply those remedies to panel data generated from the model. The unfortunate conclusion is that, at least in the ownership–performance context, proxy variables, fixed effects, and instrumental variables do not generally provide reliable solutions to simultaneity bias.