Not all people with health problems are disabled. Some individuals with severe physical or mental impairments, such as blindness or limb amputation, continue to hold jobs and generally function satisfactorily.They constitute, however, a group of potentially disabled individuals who might apply...

We evaluate the competitive and governance effects of quot;duality.quot; Duality refers to the joint membership (e.g., by banks) in competing associations or joint ventures (e.g., Visa and MasterCard). We first show that the not-for-profit nature of the associations along with the usage-based...

This paper considers tests of the parameter on endogenous variables in an instrumental variables regression model. The focus is on determining tests that have some optimal power properties. We start by considering a model with normally distributed errors and known error covariance matrix. We...

The ongoing analysis of the effects of pension plan provisions on retirement is pursued in this paper. A primary objective of this paper is to test the validity of models previously developed and estimated with data from a Fortune 500 company, here using data from a second large company. The...