Efficiency in health service sector is very important because the health sector is a major consumer of resources (especially financial). In this paper the author aims to analyze the efficiency in a social sector (healthcare system) based on cost-benefit analysis.

This paper aims to bring into attention the concept of renewable energy investments’ efficiency and to study one of the three concepts related to it, namely environmental efficiency of investments in renewable energy. The analysis is undertaken at macroeconomic level for several countries in...