Preclusive purchasing
（重定向自Preclusive buying）
Preclusive purchasing (also known as Preclusive buying and Preemptive buying) is an economic warfare tactic where one belligerent in a conflict purchases matériel and operations from neutral countries not for domestic needs, but in order to deprive other belligerents their use. The tactic was proposed by the French in World War I but never implemented.