Performance efficiency of human labor input is considered one of the most important factors affecting enhancement the production, there are some criteria that may be used to exploring performance efficiency of the worker. The research problem, can be summarized in the deviation the actual...

Household in developing countries use a variety of informal and formal mechanisms to cope with risk, including mutual support and public social security program. The present study addresses the issue of the relationship between social network and social protection both formal and informal. Using...

The selection process of the most valuable player (MVP) in the National Basketball Association (NBA) was recently questioned as to whether African American players were treated unfairly based on their race. Using NBA voting data from the 1995-2005 seasons, two empirical models are developed to...

In any nonlinear “difference-in-differences” model with strictly monotonic transformation function, the treatment effect is the cross difference of the observed outcome minus the cross difference of the potential non-treatment outcome, which equals the incremental effect of the interaction...