barter, be employed, buy and sell, carry on business, change, deal, exchange, follow a trade, give in exchange, have a job, horse-trade, interchange, keep up, labor, moonlight, practice a profession, set up shop, stay employed, swap, swap horses, switch, take in exchange, toil, trade, trade in, trade off, trade sight unseen, traffic, transact business, truck, work, work at, work for