The Discussion Papers series presents results from ongoing research projects and other research and analysis by SSB staff, intended for international journals or books. The views and conclusions in this document are those of the author(s).
We begin by providing necessary and sufficient conditions for these estimands to be given a causal interpretation as a positively weighted average of heterogeneous ETI parameters. We then apply these results to empirically analyze a reform of the Norwegian tax system that reduced the marginal tax rates on middle and high incomes. The estimated ETI parameters increase steadily with income, meaning high-income individuals are more responsive to tax changes than middle-income individuals. Next, we show how (un)compensated elasticities of labor supply can be bounded directly from the ETI estimands, or point identified by combining these estimands with estimates of earnings responses to lottery winnings. The results suggest an (un)compensated elasticity of 0.1 (0.0) for middle-income individuals. The (un)compensated elasticity estimates increase steadily with income to around 0.45 (0.3) for high-income individuals. These findings imply a substantial excess burden of taxation, and that reducing top-income tax rates would increase tax revenue. Our findings are also informative about how the intertemporal elasticity of substitution and the Frisch elasticity vary across the income distribution.