Productivity Change and Grain Farm Practice on the Canadian Prairie, 1900–1930
研究了1900至1930年间加拿大草原地区农场土地产出下降（最高达25%）但非土地投入生产率大幅上升（超300%）的现象，指出后者才是草原农业盈利和小麦供给扩张的主因。
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.