Suppose Wilfred, a typical citizen, has the utility function Um, d, h) = m + 13d - d' - 4h, where d is the number of hours per day that he spends driving around, h is the average number of hours per day spent driving around by other people in his home town, and m is the amount of money he has left to spend on other stuff besides gasoline and auto repairs. Gas and auto repairs cost $1 per hour of driving. If each citizen believes that their own driving will not affect the amount of driving done by others, they will all drive Dj hours per day. If all citizens drive to maximize the utility of a typical citizen, they will all drive D2 hours per day, where D1= D2= 6. D1= 6 and D2= 2. D1= 8 and D2= 5. D1= 6 and D2= 4. D1= 9 and D2= 0