2Clague, C., P. Keefer, S. Knack and M. Olson. Contract-intensive money contract enforcement property rights, and economic performance[J]Jounml of Ecomomic Growth, 1999( 4 ).
5A.Mattoo, R.Rathindranand A. Subramanian. Measuring Services Trade Liberalization and Its Impact on Economic Growth:An Illustration[R]. World Bank Working Paper, 2001.