Not-for-profit firms are greatly over-represented in the childcare, medical care, education and care for the aged sectors where service providing workers, as well as purchasers, seem to care about the level or quality of service being provided. Since all individuals who care about service levels...

A group of agents voluntarily participates in a joint project, in which efforts are not perfectly substitutable. The output is divided according to some given vector of shares. A share vector is "unimprovable" if no other share vector yields a higher sum of payoffs. When the elasticity of...