20 Why is it often difficult for competitors to outperform a niche strategy as used by Pajamagram (pajamagram.com) or Vermont Teddy Bear (vermontteddybear.com)? 21 Why does Dell use mass customization? How could a large company using a masscustomization strategy match the effectiveness of a niche competitor? 22 How could customer relationship marketing be used by a travel agency, and why would it likely improve the travel agency's customer satisfaction and retention