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