Q 1.Whose work do conflict theorists rely on to help form their arguments surrounding social stratification? 2..GNI PPP, or gross national income divided by purchasing power parity, helps measure: 3,.One main issue in studying global social inequality is: 4.What is particularly unique about the United States middle class? 5.Charlotte was born to a lower class family in rural Pennsylvania. After taking a job in the mail room of a large corporate office, Charlotte is slowly promoted through the ranks and becomes CEO of the company by the age of 50. What type of stratification is shown in this story?