sure but there's other research to show that beyond union, but much more so that has to do associate namiconditions >> there's also the question and how do you develop a system that creates overall the best teachers, do you develop that by going after the bad teachers or teacher attrition, there's a lot of debate on that, i think unfortunately were at the ends, three minutes. >> so this will be the rapid response. you really have to ask your question quickly if you want answers. >> my name is dashmac, student at usc. i'm curious what to think about the cost of professional education today of medical schools in law school for costs are approaching a hundred thousand dollars for use. >> answer, anybody. >> it's very difficult to afford these opportunities for many people. it's important to keep in mind to distinction, there's the sticker price you're quoting and then a tremendous amount of discounting for that, we don't have time to find those but many people don't pay it. another aspect is you have to look at any investment, this is an investment. if you take those loans and you do it you h