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T his article analyzes the costs and benefits of job rotation as a mechanism with which the firm can learn about the employees' productivities and the profitability of different jobs or activities. I compare job rotation to an assignment policy where employees specialize in one job along their career. The gains from adopting a job rotation policy are larger(More)
A consortium of institutions from Texas and Mexico has launched a new initiative for developing vaccines and other tools to control and eliminate neglected tropical diseases in Mesoamer-ica. The southern United States and northern Mexico not only share a border, they also share history, culture, and language. With its constant exchange of people and goods,(More)
Here, we investigated the role of EhVps32 protein (a member of the endosomal-sorting complex required for transport) in endocytosis of Entamoeba histolytica, a professional phagocyte. Confocal microscopy, TEM and cell fractionation revealed EhVps32 in cytoplasmic vesicles and also located adjacent to the plasma membrane. Between 5 to 30 min of phagocytosis,(More)
A reverse merger (RM) is a technique in which a private company is acquired by a shell or defunct public company via stock swap. As a result, the private company becomes public. The main difference between an IPO and a RM is that an IPO allows going public and also allows raising capital while the RM only allows going public. This paper addresses the(More)
This dissertation proposes new instrumental variable methods to identify, estimate and test for causal effects of endogenous treatments. These new methods are distinguished by the combination of nonparametric identifying assumptions and semiparametric estimators that provide a parsimoniuous summary of the results. The thesis consists of three essays(More)
This paper presents a model in which a firm with a degree of R&D specialization raises external funds to develop a two-period project that involves some non-verifiable returns (R&D-type of project). Taking into account a possible opportunistic behavior by the manager, we find out that the optimal firm's debt equity ratio is negatively related to the firm's(More)
To date, the validity of empirical Bowman's paradox papers that employ mean-variance approach for testing the risk/return relationship are inherently unverifiable and their results cannot be generalized. However, this problem can be overcome by developing an econometric model with two fundamental characteristics. The first one is the use of a time series(More)
This paper presents a model in which a firm with a degree of R&D specialization raises external funds to develop a two-period project that involves some non-verifiable returns (R&D-type of project). Taking into account a possible opportunistic behavior by the manager, we find out that the optimal firm's debt equity ratio is negatively related to the firm's(More)
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