Even if the child earns 30% less than the median at that time, her income would still be higher than today’s median income. And if product innovations and improvements imply that per capita real incomes grow at 3% a year, the median income of someone 30 years from now would be more than twice today’s median income.
到那时，即使这位孩子收入比中位收入还要低30%，也仍然比今天的中位收入高。而如果产品创新和改善意味着人均真实收入增长率为每年3%，则30年后的中位收入将比今天高一倍。