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.
Preclusive purchasing drives up the price by shifting the demand curve out.
Preclusive purchasing was used by the British during World War II in order to deny Nazi Germany access to Spanish Wolframite. Similarly, the British and Americans bought chromite ore from Turkey, to reduce Turkey's ability to supply that mineral to Germany; as part of the "package deal", the Anglo-Americans had to buy Turkish dried fruit and tobacco as well.
In the period prior to the Attack on Pearl Harbor while the United States was officially neutral, the United States began to preclusively purchase Chilean copper and Brazilian manganese, rubber, industrial diamonds, quartz crystal, and mica.
- Majorie M. Farrar. Preclusive Purchases: Politics and Economic Warfare in France During the First World War.
- Gerhard Weinberg. A World At Arms, 396.
- Allied Relations and Negotiations With Turkey, US State Department, pp. 6-8
- Jonathan G. Utley Going to War with Japan, 1937-1941, 122
- Time Magazine, Economic Warfare in Brazil. June 30, 1941
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