The purpose of this study is to evaluate and compare the efficiency of healthcare systems among 28 countries around the world by applying the data envelopment analysis (DEA) method. Two output variables are used: life expectancy at birth and infant mortality rate. Four input variables are used:...

Levels of CO2 emissions from electricity generation in the U.S. have changed considerably in the last decade. This development can be attributed to two factors. First, the shale gas revolution has reduced gas prices significantly, leading to a crowding out of the more CO2-intensive coal for...