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