Situation: In the island nation of Bezun, the government taxes gasoline heavily in order to induce people not to drive  It uses the revenue from the gasoline tax to subsidize electricity in order to reduce prices charged for electricity
Analysis: The greater the success achieved in meeting the first of these objectives, the less will be the success achieved in meeting the second
The highway administration charges a toll for crossing a bridge in order to get motorists to use other routes. It uses the revenue from that toll to generate a reserve fund in order to be able one day to build a new bridge.