Regarding Coby’s earlier post: A much-overlooked aspect of the “cash for grades” idea is that it might—and, according to past research, probably will—create kids who will work for good grades only when they’re being paid for it. Sometimes, it seems, policymakers get hung up on crafting incentives to induce good behavior without thinking about how the added incentives themselves are skewing relationships and detracting from other, naturally occurring motivators.