After four years of life, children in higher-income homes have seen or heard four million more words than their low-income counterparts, and they have better vocabulary and reading comprehension. Children with the fewest material advantages therefore lag in the social world. A simple intervention, like advising lower-income parents to communicate with their children more, improves the children’s school performance.
How big was this effect and how long did it last? I'm skeptical of individual solutions to systemic problems
