Some argue that the rapid growth seen over much of the 20th century was historically anomalous, and that we are destined to return to the slower growth of centuries past. Others are more optimistic that strong growth can return.
Francesco Grigoli, Zsóka Kóczán, and Petia Topalova (2018), “Labor Force Participation in Advanced Economies: Drivers and Prospects,” chapter 2 in International Monetary Fund, World Economic Outlook (Washington: IMF, April), pp. 1-58, https://www.imf.org/~/media/Files/Publications/WEO/2018/April/c2.ashx. 8  -8Many have noted that during the current expansion, investment and capital accumulation have been lower than in previous expansions, so perhaps we just need to invest more.