Dear Economist:
Disciplining children seems simple enough. Reward them when they do well and punish them when they misbehave. They should respond to incentives, right? Am I missing something?
Tom Cookson, Berkshire
Dear Tom,
您已閱讀13%（221字），剩余87%（1504字）包含更多重要信息，訂閱以繼續探索完整內容，并享受更多專屬服務。