4ROBERT E. HALL, CHARLES I. JONES. Why Do Some Countries Produce So Much More Output Per Worker Than Others? [J ]. Quarterly Journal of Economics, 1999, 114 ( 1 ) : 83 - 116.
5YOUNG, A.. Gold into Base Metals: Productivity Growth in the People' s Republic of China during the Reform Period [R]. NBRE working paper,2000, (7856): 38 -39.
6GOLDSMITH, R.. A Perpetual Inventory of National Wealth[J]. NBER Studies in Income and Wealth, 1951, (14): 5 -61.