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Working Paper
The effects of megamergers on efficiency and prices: evidence from a bank profit function
This paper examines the efficiency and price effects of mergers by applying a frontier profit function to data on bank ``megamergers.'' We find that merged banks experience a statistically significant 16 percentage point average increase in profit-efficiency rank relative to other large banks. Most of the improvement is from increasing revenues, including a shift in outputs from securities to loans, a higher-valued product. Improvements were greatest for the banks with the lowest efficiencies prior to merging, who therefore had the greatest capacity for improvement. By comparison, the effects ...
Working Paper
Solving an empirical puzzle in the capital asset pricing model
A long standing puzzle in the Capital Asset Pricing Model (CAPM) has been the inability of empirical work to validate it. This paper presents a new approach to estimating the CAPM, taking into account the differences between observable and expected returns for risky assets and for the market portfolio of all traded assets, as well as inherent nonlinearities and the effects of excluded variables. Using this approach, we provide evidence that the relation between the observable returns on stock and market portfolios is nonlinear.
Working Paper
The diffusion of financial innovations: an examination of the adoption of small business credit scoring by large banking organizations
Financial innovation has been described as the ?life blood of efficient and responsive capital markets.? Yet, there have been few quantitative investigations of financial innovation and the diffusion of these new technologies. Of the latter, there have been only three prior quantitative studies, and all three used the same data set on automated teller machines! ; This paper makes a significant contribution to the financial innovation literature by examining the diffusion of a recent important innovation of the 1990s: banks? use of credit scoring for small business lending. The authors examine ...