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Volker Bornschier, Thanh-Huyen Ballmer-Cao, Income Inequality: A Cross-National Study of the Relationships Between MNC- Penetration, Dimensions of the Power Structure and Income Distribution, American Sociological Review, Vol. 44, No. 3 (Jun., 1979), pp. 487-506
Bornschier et al. (Fri,) studied this question.