I'm pretty sure bags of grain are still a significant unit of value exchange[1]. [1] yep: http://www.nasdaq.com/markets/wheat.aspx http://www.nasdaq.com/market

I'm pretty sure bags of grain are still a significant unit of value exchange[1]. [1] yep: http://www.nasdaq.com/markets/wheat.aspx http://www.nasdaq.com/markets/wheat.aspx