On measuring the wealth of nations: the US economy, 1964–2001
检验了Shaikh和Tonak衡量美国经济中生产性劳动的方法，指出其因数据不可得而做出的妥协不可靠，但改进后可用于剩余价值传统的实证研究。
This paper examines the methodology of Shaikh and Tonak (Measuring the Wealth of Nations, 1994) underlying their calculation of estimates of productive labour in the US economy from 1964 to 2001. The focus is not on the results but on the methods that generate them. The paper finds that the compromises made by Shaikh and Tonak because of data unavailability are unreliable, and that better approximations are possible. On this latter basis, the Shaikh and Tonak methodology can be used to provide the labour and wage estimates needed for empirical investigations in the surplus-based tradition. Copyright 2005, Oxford University Press.