3. The kinds of money Personal possession of currency is prohibited in Canadian prisons; although, in practice, prisoners still exchange goods and services. Canadian prisoners used cigarettes as a medium of exchange until smoking was banned in Canadian prisons in 2008. After 2008, prisoners looked to other items on the commissary menu to facilitate exchange. In 2008, the Wall Street Journal reported that energy bars had caught on as money in some American prisons, and the trend is slowly catching on in Canadian prisons as the smoking ban's effects sink in. Outside of Canadian prisons, people use the Canadian dollar for day-to-day transactions. One important difference between using energy bars and using dollars as money is that have intrinsic value. Energy bars are an example of money.3. The kinds of money Personal possession of currency is prohibited in Canadian prisons; although, in pra prisoners used cigarettes as a medium of exchange until smoking was banned in Ca energy bars menu to facilitate exchange. In 2008, the Wall Street Journal re d is slowly catching on in Canadian prisons as the smoking bar Canadian dollars day-to-day transactions. One important difference between usin have intrinsic value. Energy bars are an example of money.Personal possession of currency is prohibited in Canadian prisons; although, in practice, prisoner prisoners used cigarettes as a medium of exchange until smoking was banned in Canadian prison on the commissary menu to facilitate exchange. In 2008, the Wall Street Journal reported that er prisons, and the trend is slowly catching on in Canadian prisons as the smoking ban's effects sink Canadian dollar for day-to-day fiat One important difference between using energy bars have in commodity Energy bars are an example of money