[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.
Notes from Wikiquote
According to Marike Finlay (1987) Powermatics: A Discursive Critique of New Technology. p. 200 with this statement "Kenneth Boulding has shown, the extent of control is a function of loss-of-strength gradient of a political centre."