This lesson plan was developed through "Economics International," an international program to help build economic education infrastructures in the emerging market economies. It provides a description of the lesson; appropriate age level; economic concepts; content standards and benchmarks; related subject areas; instructional objectives; time required for completion; materials required; a detailed step-by-step procedure for classroom implementation; closure exercises; assessment exercises; and extension exercises. The lesson contains three activities. Students participate in a simulation that helps them recognize problems related to a barter system. (BT)