text_combined: calculating bid ask prices enron movie trading business market maker trading future movie gross box office receipt rich sent many people writing explaining movie trading idea asked us provide feedback think idea see might applicable parts enron call dynamic bid ask price process fact set bidding period closed new bid submitted system within specified amount time final clearing bid ask prices last tentative price shown public bidding period ends customers see final price market close revise bids wish think method suitable illiquid products traded via enrononline com chonawee forwarded chonawee supatgiat corp enron 04 24 2001 07 48 pm chonawee supatgiat 04 24 2001 07 40 pm richard dimichele enron communications enron communications cc chonawee supatgiat corp enron enron cynthia harkness enron communications enron communications greg wolfe hou ect ect james ginty enron communications enron communications jim fallon enron communications enron communications kelly kimberly enron communications enron communications kevin howard enron communications enron communications key kasravi enron communications enron communications kristin albrecht enron communications enron communications kristina mordaunt enron communications enron communications martin lin contractor enron communications enron communications paul racicot enron communications enron communications zachary mccarroll enron communications enron communications martin lin contractor enron communications enron communications subject calculating bid ask prices think let price float market instead trying forecast otherwise forecast consistence market may imbalance bid ask orders may end taking positions know russ martin pointed fight studio exhibitors inside information game price easily one way ensure balance bid ask orders embed exchange system inside bid ask prices front end week trading period period instead posting bid ask prices post tentative bid ask prices ask customers submit acceptable buying selling price tentative bid ask prices get updated shown public course customers revise withdraw bids anytime trading period end period calculate post final bid ask prices seller submits lower selling price final bid price gets paid bid price buyer submits higher buying price final ask price pays ask price next week repeat process way manage positions easily also behave like broker take position make profit bid ask spread worry forecasting accuracy insiders trading take position let market one decides price maintain net position zero end actual gross box office numbers reported publications customers open long short positions perfectly matched using mark market charge reduce credit risk thanks chonawee forwarded chonawee supatgiat corp enron 04 24 2001 07 24 pm chonawee supatgiat 04 20 2001 04 31 pm richard dimichele enron communications enron communications key kasravi enron communications enron communications cc martin lin contractor enron communications enron communications subject input hi rich key think idea good think market maker reduce credit risk risk default mark market charging week release new expected value gross box office receipt balance opening positions way regular future market way give margin calls couterparties expected owe us lots money last paragraph think gross box office also determined market e lots buyers offer price go offer derivative products options well chonawee