Final answer:
Brooks Brothers is using premium pricing to position its umbrellas as high-end and premium products.
Step-by-step explanation:
When Brooks Brothers prices its line of umbrellas at three price points, $58, $198, and $498, it is using premium pricing. Premium pricing is a strategy where companies set higher prices to convey a sense of quality or exclusivity to customers. In this case, Brooks Brothers is using higher price points to position its umbrellas as high-end and premium products.