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Exhibit 33-1 Country Country A B Good X Good Y Good X Good Y 60 0 30 0 40 30 20 20 20 60 10 40 0 90 0 60 Refer to Exhibit 33-1. The opportunity cost of one unit of X in country B is O 0.33 units of Y. O 2 units of Y. O 20 units of Y. O 1 unit of Y