7Friedman, Milton, 1962, Capitalism and Freedom, Chicago: University of Chicago Press,P172.
8Ingrid, Woolard and Klasen Stephan, 2005, "Determinants of Income Mobility and Household Poverty Dynamics in South Africa", Journal of Development Studies, 41(5), 865-97.
9Khor, Niny and John Pencavel, 2006, "Income Mobility of Individuals in China and The United States", Economics of Transition, 14(3).
10Olga, Canto, 2000, “Income Mobility in Spain: How Much Is There?” Review oflncome and Wealth, 46(1), 85-102.
