American families below the 25th percentile owned 0.75 cars in 1970, but owned 1.4 cars in 2015. In 1960, 35% of those families had no indoor plumbing. By 2015, virtually all had it.

American families below the 25th percentile owned 0.75 cars in 1970, but owned 1.4 cars in 2015. In 1960, 35% of those families had no indoor plumbing. By 2015, virtually all had it. https://t.co/E4X4RvYcah

— HumanProgress.org (@HumanProgress) December 10, 2019