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Under the right conditions, our brains are capable of unparalleled levels of abstract thought, such as imagining a future goal and making detailed plans about how to get there. But under adverse conditions, our brains have evolved to cut down on the flourishes and focus in on the basics of survival in the here and now.
And in our society, hardly anything is more adverse to survival than poverty. It would be foolish to spend precious mental resources thinking about solving a problem that won’t occur for a month when you can’t afford dinner tonight. A series of studies in 2013 on scarcity among people in the lab and farmers in the real world found that being deprived of money caused the equivalent of a 13-point drop in IQ. That kind of a handicap will make it hard for anyone to engage in the high-level thinking required for self-control.
Like any other kind of thinking, self-control can be taught. Children do better at self-control (and in school) when their parents teach them to solve problems independently and to participate in family decisions. But that kind of involved parenting takes time, and financially poor parents are often “time-poor,” too.
Family factors, like nurturing and stimulation, are directly linked to mental development and can be limited by time poverty. And parents living in poor, dangerous neighborhoods don’t give their children as much autonomy as parents who live in less dangerous neighborhoods. This doesn’t mean that poor working parents aren’t choosing to teach their kids self-control. It means they may be prevented from teaching self-control to their children.