It is not clear whether the measurement problem was bigger in the more distant past than it has been recently; but it is irrelevant when we think about the future. Whether growth in per capita income that is officially estimated at 1.5% is in reality more like 3%, we are enjoying the higher level of real incomes inherited from the past.
这意味着真实收入的实际增长其实比官方数据所体现的更快——可能快很多。对于二十世纪上半叶的数据是如此，并且一直到今天都是如此。不知这一测算问题在遥远的过去是否比现在更严重；但这对于我们思考未来无关紧要。不管官方测算结果为1.5%的人均收入增长实际是否为3%，我们都享受到了源自过去的实际收入的提高。子孙后代也将如此。