Economics - 1975 GARDNER, B. L. (1975). FARM RETAIL PRICE SPREAD IN A COMPETITIVE FOOD-INDUSTRY. AMERICAN JOURNAL OF AGRICULTURAL ECONOMICS, 57(3), 399–409. https://doi.org/10.2307/1238402 GRENNES, T. (1975). EXCHANGE-RATE AND US AGRICULTURE - COMMENT. AMERICAN JOURNAL OF AGRICULTURAL ECONOMICS, Vol. 57, pp. 134–135. https://doi.org/10.2307/1238856