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, market research, marketing, marketing research, peddling, promotion, retail, retailing, sales, sales campaign, sales promotion, salesmanship, selling, sellout, soft sell, swapping, trade, trading, trafficking, wheeling and dealing, wholesale, wholesaling