On March 5, China announced a GDP growth target for this year of about 5.5%, the lowest target since 1991. But that should not come as a surprise. In 2013, World Bank economists and the Chinese State Council projected that China's annual growth rate would decline to 5% by 2030. This may still be an overestimate, given that growth rates during 2010-16 have been found to be inflated by 1.8...