No Stores? No Salesmen? No Profit? No Problem for Amazon.

Why do some stores succeed while others fail? Retailers constantly struggle with this question, battling one another in ways that change with each generation. In the late 1800s, architects ruled. Successful merchants like Marshall Field created palaces of commerce that were so gorgeous shoppers rushed to come inside. In the early 1900s, mail order became the "killer app," with Sears Roebuck leading the way. Toward the end of the 20th century, ultra-efficient suburban discounters like Target and Walmart conquered all.