In a recent article in this Journal David Galenson presents an interesting hypothesis about the impact of changing relative prices on the cattle driving industry in the late nineteenth-century West. Briefly, he argues that movements of.cattle prices in the urban marketing centers relative to the local prices in the range areas affected the profitability of the industry and thus the quantity of cattle driven north from Texas. Unfortunately, in testing his hypothesis, Mr. Galenson has incorrectly interpreted the history of the southern Great Plains.