U.S. agricultural exports have deteriorated substantially in the 1980's. One explanation for this decline is the appreciation of the dollar over the 1979-85 period making U.S. exports less competitive in world markets. In 1986, in a sharp turnaround, the dollar's value has depreciated strongly against some of our trading partners' currencies. To analyze the movements in the value of the dollar including the 1986 turnaround, we developed a three-region world model. The model indicates that the 1984 and 1985 dollar appreciations outweigh the positive effect of the 1986 depreciation for wheat exports but the reverse is true for corn and soybean exports.