Vegetable farming started around 10,000 BC, likely with families growing vegetables for their own consumption or to trade locally. At first, manual labor was used, but in time livestock were domesticated and the soil could be turned by the plough. More recently, mechanization has revolutionized vegetable farming with nearly all processes being able to be performed by machine. Vegetable farmers can sell locally in farmer's markets, traditional markets or pick-your-own operations, or can contract their crops out to wholesalers, canners or retailers.