The Scorpio Miser with its special high-efficiency engine costs more to buy than the standard Scorpio sports car  At current fuel prices, a buyer choosing the Miser would have to drive it 60, 000 miles to make up the difference in purchase price through savings on fuel
It follows that, if fuel prices fell, it would take fewer miles to reach the break-even point
With the Roadmaker, a crew can repave a mile of decayed road in less time than with the competing model, which is, however, much less expensive. Reduced staffing levels made possible by the Roadmaker eventually compensate for its higher price. Ttherefore, the Roadmaker is especially advantageous where average wages are low.