Monday and Tuesday nights are usually slow nights in the restaurant business. Therefore LaRosa's Italian Restaurant offers ‘all-you-can-eat spaghetti night' on Mondays and Tuesdays. For the price of an even spaghetti dinner, customers can eat all the spaghetti they want on those nights. For the reason that it is focusing on coordinating supply and demand by varying prices the restaurant is using a (n) _____ pricing objective for service firms.