"[The loss-of-strength gradient is] the degree to which military and political power diminishes as we move a unit distance away from its home base."

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[The notion of equilibrium] is a notion which can be employed usefully in varying degrees of looseness. It is an absolutely indispensable part of the toolbag of the economist and one which he can often contribute usefully to other sciences which are occasionally apt to get lost in the trackless exfoliations of purely dynamic systems.

— Kenneth E. Boulding