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We develop a dynamic economic model that includes control variables for both nitrogen fertilizer and irrigation water to analyze interseasonal corn production and nitrate leaching in the presence of irrigation system nonuniformity. The economic model is used to estimate profit-maximizing nutrient management plans under varying levels of system uniformity. The model is also used to appraise several policy options that have been proposed in the nitrate leaching literature as a means of regulating water quality. Investments in technology are considered, as well as limits on nitrate leaching, nitrogen fertilizer, and irrigation water. Copyright 1998, Oxford University Press.

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In this article we develop a vector error correction model using weekly, point-of-purchase scanner data to investigate multivariate pricing relationships among brands competing in the domestic black and herbal tea industries. Johansen's likelihood ratio test established the prices of Bigelow black tea and Celestial Seasonings herbal tea were cointegrated; hence, the pricing decisions of the largest firms in each respective tea market were not unrelated. The black tea prices of Bigelow and Twining, the two largest firms in the black tea market, were cointegrated as well. The cointegrating vectors, speeds of adjustment, and impulse response function analysis provide unique insights into the direction, magnitude, and speed of price response in these value-added, agricultural product markets. [EconLit citations: M100, L200, L660] © 2002 Wiley Periodicals, Inc.