By treating one nuisance parameter as two distinct parameters and using some moment conditions twice, we provide an explanation to a paradox in the inverse probability weighting estimation of the average treatment effect on the treated.

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This paper estimates the impact of a large-scale contracting-out program in Guatemala, using two waves of living standard measurement surveys which collected data before and after the expansion of the program and exploiting variation in the timing of the program to estimate treatment effects....

This paper examines supply-induced demand in medicine using an exogenous income shock to obstetricians and gynaecologists caused by a declining number of births in their practice location from 1989 to 1999. The results of the present study indicate some evidence of induced demand. A 4.1...

This paper proposes a general framework of patent protection which can be applied to most existing theories, and can be used to resolve various issues regarding the protection of information technology (IT)-enabled innovations, especially those involving business methods (BMs) and software. We...

Low population density in rural developing country coupled with deficient infrastructure, weak state capacity and limited budgets makes increasing health care coverage difficult.Contracting-out mobile medical teams can be an adequate solution in this context. This paper examines the impact of a...

We examine the "learning by doing" hypothesis in medicine using a longitudinal census of laser in situ keratomileusis (LASIK) eye surgeries collected directly from patient charts. LASIK surgery has precise measures of presurgical condition and postsurgical outcomes. Unlike any other surgery, the...

In this paper, we use a longitudinal census of laser in situ keratomileusis (LASIK) eye surgeries collected directly from patient charts to examine the learning-by-doing hypothesis in medicine. LASIK surgery has precise measures of presurgical condition and postsurgical outcomes. Unlike other...

This study examines the impacts of air pollution on low birth weight by considering overtime variation in Korea in early 2000, when some parts of Korea experienced huge drop in air pollution due to regulation. The mother's exposure to ozone level above 0.12 ppm per hour during the first...