Tuition for private-for-profit trade schools that usually specialize in one field, such as hair-styling or auto mechanics, varies widely, and Unger warns students to be wary of unethical operators.

• 以赢利为目的，专注于美发或机械自动化等某个领域的学校通常收取学费的差别很大。安格提醒学生要警惕那些不道德的经营者。