According to William Thompson and Joseph Hickey's description in 2005, American families are divided into the following classes because of their family annual incomes: Upper class (top 1%): top-level executies, celebrities, heirs commonly with annual income of $500,000 or more; Upper middle class (15%): highly educated (often with graduate degrees) professionals and managers with household income varying from high 5-figure range to commonly more than $100,000. Lower middle class (32%): semi-pro