that in a casebook by picking cases that are new and challenging perhaps a good sent by judge richard posner the also pushes the envelope. you pick things that are provocative. you design problems that push the envelope yonder where the law really can safely predict. and you look at what the points are. professor field has focused on regulation versus competition. competing models and it's a false dichotomy to most of these are false dichotomies, that's the way you present things as a law professor. menu rapidly make students realize you really can't test on that simply. it's much more complicated. that's early two of regulation with competition. number two disclosure versus consumer. could -- should you tell patients. you have this tension which is pulling out all the time right now in the regulatory sphere connected conscious of hospitals but should they disclose adverse events? number three, this is a much bigger theme, patient sovereignty, patient engagement in decision-making versus her facial judgment. should we trust the doctor as if it is sure to look out for our best interest and be