UN的trade and development 2002报告在此：
http://www.unctad.org/en/docs/tdr2002_en.pdf那些数字的出处在pp 157-158，表格在pp158。所谓劳动成本是unit labor cost，BLS的定义是
http://www.bls.gov/fls/flsfaqs.htmUnit labor costs can be computed by dividing employer labor costs (payments made directly to workers plus employer payments into funds for the benefit of workers) by real value added output. Unit labor costs can also be computed by dividing hourly labor costs by output per hour.
看到这点，就不难理解为什么中国的unit labor cost比美国低只是一点点即使工资低很多：工资贵，就用资本（materialized的就是机械自动化流程等的投资）能源土地等其他factors去代替劳动力。很奇怪很天方夜谭吗？那么同是增加100元的东西，中国用的是值50元去请5元一个钟的工人去做10个钟，那些人均资本高（机械化程度高）人均能源投入多的工厂就能用60元去用120元一个钟的工人做半个钟就能做同样的东西了。（此外，这report有点奇怪，这样看来unit labor cost，as it's endogenous是不能作为比较优势的。endowment的多寡程度才是）。
此外你再一次提供了反驳你自己反人口控制的证据。在为什么中国工人工资低而unit labor cost不低的情况。
in China’s manufacturing
as a whole is low, despite the existence of highly
efficient FFEs, because the SOEs suffer from ex-
cess labour and low productivity. Thus, as seen in
that table, countries with much higher average
manufacturing wages than China’s (e.g. Chile,
Mexico, the Republic of Korea and Turkey) have
lower unit labour costs.
如果你有一点点经济学常识，就知道在技术条件一定的程度下，productivity是完全看资本到劳动力的ratio的。那么同样技术同样资本存量的情况下，人越多，人均资本越少，productivity就越低。