If we look at the evidence from some of the programs, there's a recent study of the U.S. head start program. You want to invest early. You want to target those investments to those who can ill-afford them, to answer the earlier question. But there's a “but”—you have to follow up. This is why you have to go through the entire educational continuum. If you don't follow up in the early education, the lead falls off.
On April 25th, 2013. See this statement in context.