Technical Efficiency and U.S. Manufacturing Productivity Growth
发现新投入品提高了美国制造业的技术效率水平，1950-1998年间中间投入的效率增长高于劳动和资本，效率调整后的生产率年均增长比实测值高0.4个百分点，差距源于实测增长使用了未调整效率的成本份额权重。
This paper establishes that new inputs increase technical efficiency levels for U.S. manufacturing. Over the period 1950-1998, intermediate inputs exhibited higher rates of efficiency growth than labor and capital. Efficiency-adjusted productivity growth annually averaged 0.4 percentage points above measured growth. The gap between efficiency-adjusted and measured productivity growth arises from aggregating inputs using observed, and not efficiency-adjusted, cost share weights in the calculation of measured growth. Specifically, the decline in efficiency-adjusted material cost shares, compared to the measured shares, coupled with the comparatively high material input growth rate, was the main source of the productivity gap. 2004 President and Fellows of Harvard College and the Massachusetts Institute of Technology.