The commercial concept of good faith purchase has been an effective doctrine in the law of property and contract for facilitating changes necessary to a dynamic mercantile system. Today the concept finds itself under attack. Professor Gilmore, whose definitive review of the doctrine twenty-seven years ago has been required reading, now warns that the idea may have outlived its usefulness in some areas. He and others would, for example, restrict severely its application in the law of negotiable instruments. At its elementary level, the good faith purchase doctrine depends on the question of possession. That question, in turn, rests on the commercial value one accords possession and the way one perceives the commercial expectations that ari...