I like the way you signed your letter. "A Crazy Canadian." I think what you're proposing will not become a reality in your lifetime or mine, and probably not in your children's or grandchildren's lifetimes either. Let's take that as a given. I also think there will always be some sort of medium of exchange whenever you see trade between two or more large groups of people. Even when you have only three people in an economic system, there are documented cases in which butter cookies make a good medium of exchange and demonstrate the principle of deflation when you find out that your predecessors ate most of the butter cookies. Look up the book titled "Homesteading Space: The Skylab Story" if you don't believe me; you can find it on Google Books. An RBE might work within a small group of people if you work on the principle that, if you put something of value into the system, you also have the right to take something out that's of equal value, but you want to consider the fact that you're usually working with large groups of people who are probably going to get impatient with the idea of going through a long series of complicated trades to get what they want. Really the point of having a currency is to act as a place-holder for value that you can save up and use when you need it.