A weakening of covariance property for solutions of cooperative games with transferable utilities - self-covariance - is defined. Self-covariant solutions are positively homogenous and satisfy a "restricted" translation covariance such that feasible shifts are only the solution vectors...

For the class of cooperative games with transferable utilities an excess function e is defined as a function of two variables increasing in the first variable and decreasing in the first one such that given a TU game (N,v) , a coalition S, and a payoff vector x, the value e(v(S), x(S)) is a...