A model of marketing firms in the presence of futures markets is presented and tested with data from the U.S. soybean-processing industry. Results show that production increases if output futures prices rise, material input cash prices fall, or the output cashfutures price relationship becomes more volatile. Sufficient assumptions for these results are expected-utility-maximizing competitive firms with nonincreasing absolute risk aversion and nonstochastic Leontief production functions, unbiased futures prices, and linearly related cash and futures prices. The standard marketing margin is inappropriate for analyzing market structure or risk in the presence of futures markets. price uncertainty, risk, soybean processors. The central paradigm in the analysis of marketing industries is the cash-cash marketing margin (CMM), by which we mean the relationship between cash prices of final good and material input measured at the same point in time.' The classical CMM model is the markup, according to which the spread among cash prices at different levels of the commercialization channel is a combination of a percentage markup and a constant absolute markup. Gardner shows that the markup is inconsistent with competition and advances a CMM model of a competitive marketing industry in which firms respond differently to output demand variations than they do to input supply changes. Some authors have compared the empirical explanatory power of alternative CMM models with conflicting results (Wohlgenant and Mullen; Thompson and Lyon). Brorsen et al. further developed the CMM paradigm to account for risk. They proved that, if a marketing firm is in a competitive and/or contestable market, an increase in output price risk should lead to a higher expected CMM. Their hypotheses could not be rejected when tested with data from the U.S. wheat-milling industry. The CMM ignores the role of futures markets, a weakness because futures are extensively used by marketing firms in many industries (Paul). Omission of futures in the analysis of marketing industries is paradoxical given the important body of theoretical research highlighting the impact of forward and futures markets on competitive firms (Danthine; Holthausen; Feder, Just, and Schmitz; Batlin; Benninga, Eldor, and Zilcha; Paroush and Wolf). If futures prices are relevant for marketing firms in a particular industry, then neglecting futures in the behavioral models of such an industry has potentially significant consequences. For example, the standard practice of employing the CMM to infer the efficiency or competitive nature of the industry (Hall, Schmitz, and Cothern) may be misleading because it does not reflect profit opportunities made available by the futures market. Hedging opportunities imply that risk measures based on CMM variability may also be