wharton collaborative research short note potential research wharton please review edit send indication wharton guys objective would define amount risk enterprise take difference actual amount risk enterprise chooses take based capital structure reporting structure particular one view enron hierarchy companies assuming separately quantify risks unit framework would one use analyze risk enron related question one represent risks different units risks may different types short term volatility risk catastrophic risk liquidity risk etc one focus first cut another related question decide optimal amount insurance unit level enterprise level relate decision get insurance cost benefit insurance