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Analysis of income distribution1 at the national or international level, such as is carried out in RwG, is complicated by the inadequacy of statistical data.This brief note discusses some of the limitations with respect to a particular country, New Zealand2, and in so doing indicates the degree of caution required in handling income data in any country, especially for international comparisons.Data on income are derived in New Zealand from tax returns, family expenditure surveys and the census.The last-named is a notoriously weak source of income data, and will not be discussed here.
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Brian Easton (1975) studied this question.
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