Now suppose that we lived in a much faster-growing economy, with per capita income rising at 2% annually. In that case, per capita income would double after only 35 years, and an eight-fold increase would take only a century.
现在，假设我们生活在一个增长得更快的经济中，人均收入每年能增长2%。在这一情形中，人均收入过每35年便可翻一番，增长8倍只需要100年时间。