Nance Technologies, Inc. has agreed to sell some of its computers to a company in Bascovina, a country whose currency is worthless outside its own borders. As part of the agreement, Nance will sell the foreign customer its computers in exchange for a specified number of tons of coffee, a major export of Bascovina. Nance has already arranged to sell the coffee to a major processor for a set price in U.S. dollars. Nance has engaged in: