Is College Debt Worth It?

For an article in USA Today,Laurence Kotlikoff, an economist at Boston University attempted to answer the question using number-crunching data from the free software he developed called ESPlanner Basic.
He analyzed four hypothetical scenerious to determine lifetime disposable income of 18-year olds:
1) One who borrows $30,000 a year to attend a four-year college.
2) One who borrows [...]