Final answer:
True, Amazon and Barnes & Noble adjusted better to market changes than Borders, with Amazon changing the industry through online sales and economies of scale, while Borders went out of business.
Step-by-step explanation:
The statement that Barnes & Noble and Amazon were more competitive than Borders and adjusted more effectively to changes in the retail book market is True. Amazon revolutionized the industry by selling books online, thereby offering a vast selection that physical stores could not match. They capitalized on economies of scale, utilizing highly computerized warehouses in low-rent areas, cutting costs significantly compared to traditional brick-and-mortar stores. Barnes & Noble, while struggling, has managed to survive thus far unlike Borders, which failed to adapt and ultimately went out of business.