7Opinion Research Centre, The Motivation of Top British Management (OPR,1977) .
8"The New Jersy Negative Income Tax Experiment , 1 Rich, the Poor, and the Taxes they Pay, Joseph A. Pechman, Brookings Institution, Harvester Press, Brighton, 1986,193-207
9George F. Break. Income taxes and incentives to work: An empirical study[J]. American Economic Review, Vol. 47,1957:529-549.
10Donald Fields , W T Stanbury. Income taxes and incentives to work: Some additional empirical evidence[J]. American Economic Review,Vol. 61,1971;435-443.