The following paper analyzes the problem of social cooperation in the provision of a public good from an evolutionary … principle of reciprocity. It will be shown that the degree of cooperation, that is the individual contribution toward the … of the nonprofit sector may well be based on conditional cooperation. …

of randomized experiments also in observational studies. Additionally, we evaluate the real possibilities of these … methods. From a theoretical point of view, these methods can be developed in randomized experiments, although they are often …

characteristics that may influence the entrepreneurial process, focusing specifically on the identification of entrepreneurial … (specially prior knowledge), and the sources for opportunity identification play in the discovery of new opportunities. …