The current teacher salary scale has come under increasing fire, and for a reason. Systems where people are treated more or less the same suffer from two basic problems. First, there will always be a number of "free riders". Second, and relatedly, some people may feel their contributions aren’t sufficiently recognized. So, what are good alternatives? I am not sure; but based on decades worth of economic and psychological research, measures such as merit pay are not it.

Although individual pay for performance (or merit pay) is a widespread practice among U.S. businesses, the research on its effectiveness shows it to be of limited utility (see here, here, here, and here), mostly because it’s easy for its benefits to be swamped by unintended consequences. Indeed, psychological research indicates that a focus on financial rewards may serve to (a) reduce intrinsic motivation, (b) heighten stress to the point that it impairs performance, and (c) promote a narrow focus reducing how well people do in all dimensions except the one being measured.

In 1971, a research psychologist named Edward Deci published a paper concluding that, while verbal reinforcement and positive feedback tends to strengthen intrinsic motivation, monetary rewards tend to weaken it. In 1999, Deci and his colleagues published a meta-analysis of 128 studies (see here), again concluding that, when people do things in exchange for external rewards, their intrinsic motivation tends to diminish. That is, once a certain activity is associated with a tangible reward, such as money, people will be less inclined to participate in the task when the reward is not present. Deci concluded that extrinsic rewards make it harder for people to sustain self-motivation.

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