You people dont seem to understand what money is... Lets take a walk down learning lane...
In fact a note is only werth the paper and ink it is printed on, a coin is only werth the metal it is made of and a credit card is only werth a certain amount of plastic, BUT... These all LEAGLY reppusent a certain amount of good old GOLD and they are all compleatly interexangable with each other...
You see there is only a certain amount of gold in the world and if everybody got their share we would each have a few bits of gold dust as our life saving (can you imagen trying to buy something cheap?!), so we use big chuncks of paper and metal and even virtural credit as a voucher for gold...
Why GOLD?... Well most things could be made or found at huge profit unless the exchange rate was very low, So you would need a lot of that thing to bye something, therefore banks would need to be huge and international trading (which uses actural gold instead of credit) would be hard. Also gold can only be found and moved not made.
So the question should be not wether Mollar is note, coin or credit but what substance or thing it is a voulcher for...
