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The beauty of this model is anyone can become a gateway at any time.If this takes off, then you could use this to build the killer "spot me $5" app. A few weeks ago when some friends were describing the spreadsheet they used to track who owes what to who, I proposed a micro-virtual currency limited to just the circle of friends that all trust each other, whereby exchanging the virtual currency you can transfer debts, and trivially find out who owes money and who is owed just by looking at the current account ledger. Seems like Stellar enables that on a massive scale, without everyone needing to trust each other, because the coins are all tagged with the issuer.
Stellar uses real-world currencies to denote the held values. Does it limit these currencies to actual known entities, or could I become an issuer and start issuing credits in a fake currency? If I can do that, then it seems like there's an opportunity here to use Stellar to track things other than monetary exchanges. As a hypothetical example, if I had several kids, they could all trust each other to issue units of a fake currency called "Chore". If I ask one of them to do something, they could instead pay 1 Chore to their sibling to have them do it instead. This can of course be redeemed later if I ask the sibling to do something. Since it's a fake currency, it has no real value and can't be traded outside of the small group of kids (as nobody would accept it). This sort of thing can't be done with e.g. USD because the proxy money could be traded to someone else who doesn't realize that I won't actually accept it back for money.