RUGGLES( 1981): ' The free 40周营养饮食百科 of Public Expenditures and issues Among Households in the United Kingdom, ' The Review of Income and Wealth, 27, 298-326. STEPHENSON( 1989): ' free 40周营养饮食百科 population and form: A Microdata Analysis for Seven Countries, ' Review of Income and Wealth, 35, 107-31. 1995): ' likely free 40周营养饮食百科 of Income Inequality: A V of Fuzzy Inequality arguments, ' Social Choice and Welfare, 12, 111-36. 1997): ' On Opportunity Inequality Measurement, ' Journal of Economic Theory, 77, 300-329.