Abstract
This study constructs indexes of productivity change to show that the yield of prairie farm land fell, in some cases as much as 25 percent, while the productivity of non-land inputs rose 300 percent or more from 1900 to 1930. It was this latter productivity growth, rather than the supply of prairie wheat land emphasized by the “staples approach” to Canadian economic history, that made the western prairie profitable to farm, and that contributed most to expanding the supply of prairie wheat. Much of the post-World War I expansion of settlement was on the drier and relatively low yielding parts of the Canadian prairie.

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