One Thousand Ways to Make Money by Page Fox

291. TRAVELING SALESMAN.--In some houses a traveling salesman is allowed

a standing commission on all goods bought by firms whose custom was secured through his influence. As the commission continues as long as the customer continues the trade at that house, some agents, after a few years of active work are enabled to retire on incomes of $2,000, $3,000, and in some cases of $5,000 a year. The business done by drummers is immense. Three hundred million tons of goods are shipped by them yearly, and the business amounts to nearly $2,000,000 a day.