In the United States, automobile model year sales traditionally begin with the fourth quarter of the preceding year. So model year refers to the "sales" model year; for example, vehicles sold during the period from October 1 to the next December 30 is considered one model year.[1] In addition, the launch of the new model year has long been coordinated to the launch of the traditional new television season (as defined by A.C. Nielsen) in late September, because of the heavy dependence between television to offer products from automakers to advertise, and the car companies to launch their new models at a high-profile time of year [2].