Footwear designer John de los Santos last year released several limited editions of his best-known model of sneaker in exotic colors and prints. Although the new releases were priced substantially higher than their counterparts in more traditional colors, they sold out within a week of their release, and have since been selling on the resale market for up to four times the original price. The cost of producing the sneakers in exotic prints is no greater than that of producing them in more traditional colors, so de los Santos could earn a higher profit per unit by producing a greater percentage of his sneakers in such prints. Which of the following is an assumption made in drawing the conclusion above? ["Consumers' willingness to pay higher prices for the exotic sneakers was not influenced by the relative scarcity of those sneakers.", "The workmanship of de los Santos's sneakers is of such high quality that it is impossible for lower-budget shoemakers to produce counterfeit versions of them.", "De los Santos's sneakers are not priced substantially higher than those of the designers who compete most directly with him.", 'The designers who compete most directly with de los Santos will not produce similar lines of limited-edition sneakers in the near future.']