The Forgotten Depression, Jim Grant's excellent book about the 1920 - 21 downturn and the recovery that followed, has generated a burst of critical commentary from persons anxious to reject the principal conclusion Grant draws from that episode. (alt-m.org)
A principal conclusion was that the 500 million residents of North China experienced during the 1990s a loss of more than 2.5 billion life years owing to the added air pollution, and an average reduction in life expectancy of 5.5 years. (journals.plos.org)
Principal conclusions, which are explained more fully in the letters, include the following: (mjwhitman.pressbooks.com)