5. Accounting earnings depend on the reasonable proportion of income and expenses during the period. Costs that are not associated with the current period should be incurred as assets to be transferred for later periods. If classical economists have interpreted the "market" as "laissez-faire", coase has answered the question of how to achieve "laissez-faire" or "price mechanism". According to the latest data released by the U.S. Department of Transportation, the number of driving miles (VMT) in October 2017 is 268 billion miles, up 0.8 percent year on year and 0.2 percent month-on-month. According to the data, total vehicle mileage is expected to reach 2.685 trillion miles in 2017.