The economist Brad DeLong explains that before the Industrial Revolution the comfortable people of the world had to “attain such comforts…by taking from others, rather than by finding ways to make more for everyone.” In other words, if they wanted to be happy, they probably had to make another unhappy. But today, DeLong writes, “less than 9 percent of humanity lives at or below the roughly $2-a-day living standard we think of as ‘extreme poverty,’ down from approximately 70 percent in 1870.” That figure is adjusted for inflation. “And even among that [poorest] 9 percent, many have access to
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