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While many methods have been proposed for evaluating agricultural processing market efficiency, estimation of product marketing margins has received the most attention and direct research effort. Despite this fact, there are many technical and statistical problems associated with both the performance of marketing analyses and utilization of margin reports. Most early marketing margin studies either ignored or circumvented these problems, concentrating on estimating absolute magnitudes ofdoi:10.1017/s0081305200012917 fatcat:j7uvsavl4vbgxbvb3helrez3xm