Social capital arises from the willingness of people to cooperate with each other. In doing so, energies are created (social capital) that are beneficial for the community and that have an impact on the common good. The term was first used in the U.S. and gained new popularity in the early 1990s through research publications of Robert D. Putnam. Social capital includes trust, shared norms, mutual support and informal relationships in a society. In addition to human capital, manufactured capital and financial capital, it is the fourth asset of a society.