They were initially bred as butchers and are prolific gamblers, merchants, and slave traders, and amongst their favourite commodities are the "Felis sapiens" race. The universal currency of the Brefewino is Brefewinan, a kind of green lumpy paste in jars (made from small delicately preserved pulses). In order to enter a Brefewino trading post one must show exactly what their specific profession is with a "badge of merchantship". For example, Lister wears a potato to signify he is a farmer. Brefewino gambling dens resemble a "Star Wars" cantina. Brefewino music utilises more traditional instruments but is still fairly raucous and their beer is exceptionally strong.