A team of sociologists recently posited that there are six social classes in America. In this model, the upper class (3% of the population ) is divided into upper-upper class (1% of the U.S. population, earning hundreds of millions to billions per year) and the lower-upper class (2%, earning millions per year). The middle class (40%) is divided into upper-middle class (14%, earning $76,000 or more per year) and the lower-middle class (26%, earning $46,000 to $75,000 per year). The working class (30%) earns $19,000 to $45,000 per year. The lower class (27%) is divided into working poor (13%, earning $9000 to 18,000 per year) and underclass (14%, earning under $9000 per year).