Ok, a few things to mention:
a) Link, nice Mag in your picture. =)
b) The idea of a credit note, while it does eliminate some problems, it also causes others. If someone wanted to but an item from another player, a credit note wouldn\'t be useful, unless that chaecter was then able to trade the credit note in for gold. Which completely kills the whole reason for doing the credit note, which is so that others don\'t end up with the money.
c) Tornado, That\'s the way loans work in real life. You take out some money, use it to start a business, or something, then pay the money back over time, generaly with interest added on. You take the loan to give yourself the boost you need to get going, and then once you\'re on your way you can pay it back.
d) The karma idea isn\'t a bad one. The only issue(this was raised in the thieves post as well,) is how do we define/determine karma? In UO it was based solely on what you killed, but clearly there are other things that you can do to gain karma besides killing things. Let\'s say someone wants to start an alchemist shop. If they were an alchemist, they probably wouldn\'t be out killing things very often. Then they\'d probably have to take a loan out to start a shop up, but how could they get that loan without killing things first for karma? A karma system will be valuable, but it will be tough to implement well.