Turnover time and the organic composition of capital
论证马克思的资本有机构成和价值构成概念依赖于可变资本周转时间，并给出测量方法，应用于1947年以来的美国国民账户，结果支持马克思关于资本有机构成上升和利润率下降趋势的预测。
This article argues that Marx's key concepts of the organic and value compositions of capital depend on his concept of the turnover time of variable capital. Methods are given for measuring these three indicators, which are applied to the US national accounts from 1947 onwards. The results show unambiguous tendencies for the organic and value compositions of capital to rise, and for the turnover time of variable capital to fall. This is consistent with Marx's predictions in Capital and his explanation for the tendency of the rate of profit to fall.