Despite its increased dependence on the international economy, America continues to behave as if it were either a closed economy or the leader whom everyone else should automatically follow. Robert Gilpin
The closed economy of the future might similarly be called the 'spaceman' economy, in which the earth has become a single spaceship, without unlimited reservoirs of anything, either for extraction or for pollution, and in which, therefore, man must find his place in a cyclical ecological system. Kenneth Boulding