Before revision:  This is characterized by negative definiteness of the Jacobian matrix of the payoff function and satisfied globally in a contractive game and locally at a regular ESS. We say an evolutionary dynamic is economically reasonable , if an agent' s choice of a new strategy can be justified as an optimal choice possibly by introducing additional costs and constraints ;
After revision:  This is characterized by negative definiteness of the Jacobian matrix of the payoff function . We consider economically reasonable dynamics, in which we can justify agents' choices of new strategies as optimal choices possibly by introducing additional costs and constraints ;