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2. M. Friedman, Capitalism and Freedom (Chicago University Press, Chicago, 1962).
3. Distribution, Transitivity and Little's Welfare Criteria
4. H. P. S. Rachman, Ph.D. thesis, Bogor Institute of Agriculture, Bogor, 2001.
5. N. G. Mankiw, Macroeconomics 5th Edition (Worth Publishers, New York, 2002).