Rising wealth inequality: when r − g matters
研究利用继承财富和生产力继承模型，分析资本回报率与经济增长率之差（r−g）对财富不平等的影响，发现劳动收入异质性导致r−g对财富不平等呈U型效应，且当健康类型分布良好且r−g超过正阈值时，长期不平等加剧。
Abstract We investigate the effects of the gap between the rate of return on wealth and the growth rate, r − g, on wealth inequality using a model of inherited wealth and productivity inheritance featuring heterogeneity in labor income and in the death rate. The heterogeneity in the death rate implies different health types, which imply type dependence and scale dependence. Labor income heterogeneity implies a U-shaped effect of r − g on wealth inequality. Long-run wealth inequality increases in r − g if the distribution of the death rate features good-health types and if r − g is sufficiently larger than a positive threshold, which is increasing the dispersion of labor income. The share of good-health types and the r − g’s threshold in the Survey of Consumer Finances are 31.8% and 4.5%, respectively.