agency, barter, bartering, brokerage, buying and selling, consumer preference study, consumer research, consumer survey, dealing, direct-mail selling, doing business, exchange, give-and-take, hard sell, hawking, high-pressure salesmanship, horse trading, huckstering, interchange, jobbing, low-pressure salesmanship, mail-order selling, market research, marketing, marketing research, merchandising, peddling, promotion, retailing, sales campaign, sales promotion, salesmanship, selling, sellout, soft sell, swapping, trade, trading, trafficking, wheeling and dealing