Escaping the scarcity trap does not merely require an occasional act of vigilance. It requires constant, everlasting vigilance; almost all temptations must be resisted almost all the time. Now, might not willpower build up with practice? Might not the poor, having to exercise it constantly, develop stronger willpower? There is little evidence to show that willpower capacity increases with use. (Think of how ironic this would be relative to common belief: the poor having greater willpower!)
