This is an interesting angle. The important thing to note is the "I owe you $10" piece of paper is worth roughly $10 when it comes from a trusted source. I thi

This is an interesting angle. The important thing to note is the "I owe you $10" piece of paper is worth roughly $10 when it comes from a trusted source. I think if I wrote that it might not be worth the full $10 in "publicly traded" circumstances. There's an interesting exercise in how bank-like you can become before you need to register as a financial institution.