yield management systems are used to: select one: a. fill unused capacity by discounting early purchases, limiting early sales at those discounted prices, and overbooking capacity. b. reduce break-even points when fixed prices are judged to be too high. c. maintain the optimum amount of input in order to take advantage of consumers' product perceptions. d. reduce consumers' cognitive dissonance due to late responses to demand. e. create demand for products that ar