This paper has two purposes: first, to demonstrate a utility function of consumption and leisure that leads to a backward-bending supply of labor. The second purpose is to show that in spite of the fact that a Laffer curve of any individual in a society may have one-peak point where tax revenue is at its maximum, the aggregate (macro) Laffer curve is very likely to have multi (or at least dual) peaks. This is caused by the high degree of inequality in wage distribution in most western countries.
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