Elizabeth graduated from high school and continued her education at a local university. She earned a degree in nursing and has a full time job at Cleveland Clinic. Ellen, her sister, chose to attend the community college and graduated with a two-year degree. She works as a paralegal for a local attorney. William, their youngest brother, earned his Ph.D. from Princeton . His salary is one-and-a-half times that on Elizabeth's. How would an economist explain this?
