[nimnio]

The paper you're citing investigates the idea that "early childhood investments have significantly higher benefit cost ratios than those targeted at older age group", and it concludes that "there may in fact be no relationship between program cost effectiveness and the age of the recipient."

From this you seem to have drawn the surprising conclusion that there is no benefit to greater in investment in early childhood education, a conclusion which the paper you're citing specifically warns against:

> This finding does not imply that there should be less investment in early childhood programs. There are many early interventions that have large positive rates of return, and there are powerful equity reasons for investment in children.

> The data shows that prevention can be cost effective, but in addition, later treatment and amelioration using evidenced based programs can also succeed.