This is too simplistic. The item might have variations (such as crude oil) which leads to different choices on import vs. export. The geographic source and des

This is too simplistic. The item might have variations (such as crude oil) which leads to different choices on import vs. export. The geographic source and destination might be important (well might be close to foreign refinery and vice versa). The method of shipment might matter (ship, rail car pipeline). The previous contracts and obligations might matter and so on