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Content: Economic comparisons of conventional and sustainable
farming systems, for example, have assumed that farmers will
continue to produce the same basic commodities for sale in highly
competitive national and international agricultural markets. Yields and costs per unit of production are compared for
conventional and alternative systems (Ikerd, Monson and Van Dyne,
1992; Repetto and Faeth, 1990; Pimentel, et. al., 1991). Any
differences in commodity prices among alternative scenarios are
attributed to differences in production levels and market
supplies (Knutson, et al., 1990). For example, organic price
premiums are either ignored or treated as transitory advantages
that will be eliminated by competition (Dobbs, Leddy, and Smolik,
1988; Dobbs and Cole, 1992).