Some International Comparisons of the Age of the Machine-Stock
重新审视英、德、法、日、美五国金属加工业机床使用年限的邮政调查，发现日本机床最年轻，英国机床平均年龄低于法、德、美；数控机床在所有国家重要性上升，但在英法较少。质疑国民账户统计中机械寿命过短的假设，并提出改进未来机床调查的建议。
This paper re-examines recent postal surveys of the stock of machinery in the metal-working industries of Britain, Germany, France, Japan and the United States. Japan has the youngest stock; Britain's stock has a lower average age than those in France, Germany and the United States. Numerically-controlled machines are rising rapidly in importance in all countries, but were less frequent in Britain and France. Questions are raised as to the unduly short-life of machinery assumed by national accounts statisticians; and suggestions are made for the improvement of future machine tool surveys.