An interesting real-life example of failed economical incitements is a case here a kindergarten started to charge an extra cost for "late pickups", ie later tha

An interesting real-life example of failed economical incitements is a case here a kindergarten started to charge an extra cost for "late pickups", ie later than the what the contract stipulated. The end result was that "late pickups" increased as the shame of being late was replaced with a transaction fee, signalling that late pickups where allowed by the rules.