While real GDP per capita in the U.S. dropped below its trend after 2007, he pointed out that the shock was mostly to the level of GDP per capita, not to the growth rate. However, he added that the growth rate after 2007 was slightly less than before.
In contrast, Vandenbroucke noted that Japan did not experience a sudden drop in the level of real GDP per capita in 1990, but the growth rate dropped considerably. He added that real GDP per capita has been relatively stable in Japan since the early 1990s.
“The Japanese data reveal that the Lost Decade is clearly a case of slow growth rather than of a sudden negative shock to GDP per capita. The U.S. data, slightly varied, reveal that the Great Recession is the opposite case,” he wrote.
(For figures showing the trends in real GDP per capita in the U.S. and Japan, see the Economic Synopses essay “Comparing Japan’s Lost Decade with the U.S. Great Recession.”)
Whether the change was in the growth rate or in the level has implications for how long it takes GDP per capita to double, Vandenbroucke explained.
For the U.S., which experienced a sudden drop in the level of GDP per capita, he found:
For Japan, which experienced a considerable drop in the growth rate of GDP per capita, he found:
Based on these numbers, Vandenbroucke noted that it would take about 56 percent more time for GDP per capita to double in the U.S. compared to the earlier period, whereas it would take about 470 percent more time than before to double in Japan.