K A business analyst gives the following advice to managers of firms: "If you continue to swim in a sea of sameness, you are going to drown." Source: Steve Dennis, "Macy's and JC Penney Earnings Offer Evidence of the Stall at the Mall; Here's How They Can Get on Track," forbes.com, February 28, 2019. Briefly explain what he means. Firms that fail to continually differentiate their products from the products of competitors will be unable to earn an economic profit in the run