#exchange.commercialism__interchange  reciprocal transfer of equivalent sums of money especially the currencies of different countries: "he earns his living from the interchange of currency"
  supertype:  commercialism__commerce__mercantilism  transactions having the objective of supplying commodities
  subtype:  conversion.exchange  act of exchanging one type of money or security for another
     subtype:  unitisation  conversion of an investment trust into a unit investment trust
  subtype:  barter__swap__swop__trade__quid_pro_quo  an equal exchange; "we had no money so we hd to live by barter"
     subtype:  horse_trade__horsetrade__horse_trading__horsetrading  the swapping of horses (accompanied by much bargaining)
  subtype:  foreign_exchange__foreignexchange  the system by which one currency is exchanged for another; enables international transactions to take place

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