How did American methods of selling goods change at the turn of the 20th century and how has that influenced buying and selling of today?

How did American methods of selling goods change at the turn of the 20th century? Americans started using catalogs there were also chain stores and department stores opening up. 1 How did American buying patterns change during the 1920s? 2 How did consumer goods change American society during the 20’s? 3 What was

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