Un article publié par le NBER hier montre qu’une baisse des impôts (des taux marginaux précisément) sur les 1% les plus riches, leurs revenus augmentent … mais le PIB aussi.

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This paper estimates the dynamic effects of marginal tax rate changes on income reported on tax returns in the United States over the 1950-2010 period. After isolating exogenous variation in average marginal tax rates in structural vector autoregressions using a narrative identification approach, I find large positive effects in the top 1% of the income distribution. In contrast to earlier findings based on tax return data, I also find large effects in other income percentile brackets. A hypothetical tax reform cutting marginal rates only for the top 1% leads to sizeable increases in top 1\% incomes and has a positive effect on real GDP. There are also spillover effects to incomes outside of the top 1%, but top marginal rate cuts lead to greater inequality in pre-tax incomes.