$4500 credit for trade in your old car

If the is just old that is not enough. It must be a car that only gets 15 miles or less a gallon. At leasy I think its 15 miles. I think this is really bad for the economy because most of these people drove these cars because they could not afford a new one. I think they should have to pay cash for the rest of the car. I do not think it is a good idea to give loans to these people because they probably will not pay the loan payments and then the car will be repossed.