#barter__swap__swop__trade__quid_pro_quo  an equal exchange; "we had no money so we hd to live by barter"
  supertype:  #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"
  subtype:  #horse_trade__horsetrade__horse_trading__horsetrading  the swapping of horses (accompanied by much bargaining)

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