A 2008 working paper sponsored by the International Monetary Fund showed "that the Laffer curve can arise even with very small changes in labor supply effects", but that "labor supply changes do not cause the Laffer effect".
” 国际货币基金组织2008年的一篇工作论文表示“劳动供给的极小变化会使拉弗曲线上升”但“劳动供给变化不会导致拉弗效应”。