Early intervention programs enrich adverse family environments. The largest effects of the early intervention programs are on noncognitive traits. Now, what do I mean by that? I mean perseverance, motivation, self-esteem, and hard work.
When Hume and Adam Smith prophesied that a little increase of national debt beyond the then amount of it, would probably occasion bankruptcy; the main cause of their error was the natural one, of not being able to see the vast increase of productive power to which the nation would subsequently obtain.