Of course, this is subject to argument. There are three reasons my suggested return-on-investment might be too high. The first: even if we raised teacher salaries tomorrow, it will be several years before enough top-tier graduates are persuaded to get jobs as teachers. The second delay factor is that it takes time for the now better-educated students to reach the labor force. Finally, the spending starts now and the returns come down the line, so one needs to account for the time value of money.

Source: Los Angeles Times April 17, 2019 10:07 UTC