2. Capital-labor inequality：古典与边际主义在再分配上的分歧，在于对资本与劳力的替代性有不同看法。
3. 凯恩斯：the best-established regularity in all of economic science：around 2/3 national wage share common across different countries. (所以现代企业怎么给员工工资外补助或奖励，宏观层面看还是三分之二，所以这些补助或奖励宏观上并不是从资本到劳力的再分配，是工资支付方式不同。)
4. 现当代不平等构成：capital-labor inequality (partly due to capital market imperfection) <labor income inequality (mainly within skill inequality, but the skill is defined by years of schooling not by majors)
5. Labor income inequality: human capital (环境、家庭、资本市场、基因、教育)/skill biased technology，歧视，政治(Unions and minimium wages, which may be efficiency enhancing in the presence of other distortions), trade(不主要).
6. Fisical redistribution is usually prefered to direct redistribution, since it involves less price distortion.