The American Dream, Quantified at Last

About 92 percent of 1940 babies had higher pretax household earnings at age 30 than their parents had at the same age. (The results were similar at older ages and for post-tax earnings.)

.. For babies born in 1980 — today’s 36-year-olds — the index of the American dream has fallen to 50 percent: Only half of them make as much money as their parents did.

.. The rise of inequality has damaged the American dream more than the growth slowdown.

.. Given today’s high-tech, globalized economy, the single best step would be to help more middle- and low-income children acquire the skills that lead to good-paying jobs. Notably, most college graduates still earn more than their parents did, other data show — yes, even after taking into account student debt.