Answer: The Bancor managed by the International Clearing Union
Notes: Keynes and E. F. Schumacher proposed the Bancor as a supranational currency between 1940–1942. The International Clearing Union was suggested to manage its use in global trade. The Bancor proposal was presented by the United Kingdom at the Bretton Woods Conference in 1944. The concept was intended to prevent persistent surpluses or deficits among countries. The Bancor was not adopted; instead, the U.S. dollar was chosen as the main reserve currency.
