The indicator is the quota, just like when eating or buying a house is hot, you need to queue up to get the number. You have to have a number to qualify. The same is true of the car purchase index. Because there are too many cars, all the existing cars are like this, which can only slow down the increase of motor vehicles. So, get a car index. If you buy a car with indicators, you can get a license plate. Without indicators, you can't get a license, and fewer people buy a car.