4,000,000 buyers every month. On average, every month, approximately 1,000,000 new and 3,000,000 used autos are sold in the United States. Americans have had a love affair with cars since the first ones were produced over 100 years ago. They not only are essential to our everyday lives, and the efficient operation of our economy, but they are an expression of our personality, and often times just plain fun to drive.