News for Vietnam (and all other countries) ALL currencies are "virtual"

Seth Godin has an interesting take on that:
Money's pretty new. Before that, we traded. My corn for your milk. The trade enriches both of us, and it's simple.

Money, of course, makes a whole bunch of other transactions possible. Maybe I don't need your milk, but I can take your money and use it to buy something I do need, from someone else. Very efficient, but also very abstract.