Ecommerce offers buyers convenience . They can visit the World Wide Web sites of multiple vendors 24 hours a day and seven days a week to compare prices and make purchases , without having to leave their homes or offices . In some cases , consumers can immediately obtain a product or service , such as an electronic book , a music , or computer software , by downloading it over the Internet . For sellers , e-commerce offers a way to cut costs and expand their markets . They do...











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