原版书课后题14的答案中，最后一句，An increase in labor force participation can raise the growth of per capita GDP. 人均GDP的影响因素除了人均资本和技术进步之外，为什么还有劳动力的因素呢？人均GDP不已经是除掉了labor吗？请教如何理解，感谢！
14. B is correct. Population growth can increase the growth rate of the overall economy, but does not impact the rate of increase in per capita GDP. Therefore, population growth does not explain Country A’s higher rate of per capita income growth. An increase in labor force participation could, however, raise the growth of per capita GDP.作者: xiong23456 时间: 2018-5-16 03:36
这一题说的是labor force participation而不是population。increased labor force participation说明了人口不变的情况下更多的人工作，因此会提高人均GDP。
