From a blog by Paul Glover: http://www.shareable.net/blog/print-your-own-money?utm_content=marissa
"The economy is big news, and a big worry. But there are as many economies as we need. There are global, national, regional, and neighborhood economies. There are economies for greed, destruction, and exploitation, as well as for generosity, creativity, and love. And there are as many types of money as we need to operate these economies.