Meanings

auction

buying stolen goods

buying power

procurement

speculative buying

impulse buying

slave traffic

speculatively buying a rice harvest, while the fields are still green

buying futures

dealing in futures

negotiated transaction

broker

brokerage

buying operation

purchase

to buy (of a government, public agency, etc. from a private citizen)

to buy back

shopping bag

to buy all (of something) one can get one's hands on

to win favour