Index-number tests and the common-scaling social cost-of-living index
For a change in prices, the common-scaling social cost-of-living index is the equal scaling of every individual's expenditure level needed to restore the level of social welfare to its pre-change value. This index does not, in general, satisfy two standard index-number tests. The reversal test requires the index value for the reverse change to be the reciprocal of the original index. And the circular test requires the product of index values for successive price changes to be equal to the index value for the whole change. We show that both tests are satisfied if and only if the Bergson-Samuelson indirect social-welfare function is homothetic in prices, a condition which does not require individual preferences to be homothetic. If individual preferences are homothetic, however, stronger conditions on the Bergson-Samuelson indirect must be satisfied. Given these results, we ask whether the restrictions are empirically reasonable and find, in the case that individual preferences are not homothetic, that the restrictions make little difference to estimates of the index.
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Volume (Year): 38 (2012)
Issue (Month): 3 (March)
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References listed on IDEAS
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- Pollak, Robert A, 1980. "Group Cost-of-Living Indexes," American Economic Review, American Economic Association, vol. 70(2), pages 273-78, May.
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- David Donaldson & Krishna Pendakur, 2012.
"Index-number tests and the common-scaling social cost-of-living index,"
Social Choice and Welfare,
Springer, vol. 38(3), pages 407-429, March.
- Donaldson, David & Pendakur, Krishna, 2010. "Index-Number Tests and the Common-Scaling Social Cost-of-Living Index," Economics working papers david_donaldson-2010-4, Vancouver School of Economics, revised 04 Feb 2010.
- Atkinson, Anthony B., 1970. "On the measurement of inequality," Journal of Economic Theory, Elsevier, vol. 2(3), pages 244-263, September.
- Pendakur, K., 1999.
"Taking Prices Seriously in the Measurement of Inequality,"
dp99-7, Department of Economics, Simon Fraser University.
- Pendakur, Krishna, 2002. "Taking prices seriously in the measurement of inequality," Journal of Public Economics, Elsevier, vol. 86(1), pages 47-69, October.
- repec:cup:cbooks:9780521825511 is not listed on IDEAS
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- Sen, Amartya, 1973. "On Economic Inequality," OUP Catalogue, Oxford University Press, number 9780198281931, March.
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