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We also briefly discuss systems of distributions in order to facilitate subsequent classifications, namely, the Pearson and Burr systems and the less widely known Stoppa system. 4. f. F is continuous and supported on an interval. 1 SOME CONCEPTS FROM ECONOMICS The literature on Lorenz curves, inequality measures, and related notions is by now so substantial that it would be easy to write a 500-page volume dealing exclusively with these concepts and their ramifications. We shall be rather brief and only present the basic results.

By definition, the diagonal of the unit square corresponds to the Lorenz curve of a society in which everybody receives the same income and thus serves as a benchmark case against which actual income distributions may be measured. 1) as a sequence of standardized empirical Ð1 incomplete first moments. 1 Lorenz curve of x ¼ (1, 3, 5, 11). 1a) may be rewritten as L(u) ¼ 1 E(X ) ðu F À1 (t) dt, u [ [0, 1]: (2:3) 0 It follows that any distribution supported on the nonnegative halfline with a finite and positive first moment admits a Lorenz curve.

Koshevoy and Mosler (1997) discussed a multivariate Gini index defined as the volume of their Lorenz zonoid LZ(F), specifically G :¼ vol[LZ(F)] ¼ (d þ 1)! 1 Qd j¼1 E(Xj ) E(jdet QF j), (2:51) where QF is the (d þ 1) Â (d þ 1) matrix with rows (1, Xi ), i ¼ 1, . . , d þ 1, and X1 , X2 , . . d. f. F. It follows that this multivariate Gini coefficient may be equal to zero without all commodities being equally distributed. In fact, it will be equal to zero if at least one of the commodities is equally distributed or if two commodities have the same 42 GENERAL PRINCIPLES distribution.

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