43 The Economic Census reports there were 9,955 book stores in 2007. These book stores also offered a variety of products. to consumers. Based on this, we can conclude that book stores best belong to the market structure of * perfect competition. * monopoly. * monopolistic competition: * oligopoly. Question 44 1 pts Suppose Books-A-Million can produce 10 books per hour or 5 mp3s per hour and Amazon can produce 15 books per hour or 10 mp3s per hour, From this, we can conclude * Amazon has a comparative advantage in books. * Books-A-Million has a comparative advantage in mp3s. * Books-A-Million has a comparative advantage in books. * Amazon has a comparative advantage in both books and mp3s