Suppose the government is considering an increase in the toll on a certain stretch of highway from K.40 to K.50. At present, 50,000 cars per week use that highway stretch; after the toll is imposed, it is projected that only 40,000 cars per week will use the highway stretch. That is, an increase in the toll on a highway from K40 to K.50 would reduce use of the highway by 10,000 cars per week.