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posted by dennisn on March 1st, 2015 at 7:14PM

If you have three people on an island (as my coworker suggested), and say there is a fixed supply of 3$ distributed equally among them, and one guy asks for a 1$ loan with 1$ interest payment, that guy now needs to repay the lender 2$. Where's he gonna get that money?

Your point about interest not necessarily being mean or exploitive is a good one.

Your point about chocolate actually indirectly leads to one possible solution, even though you might not be aware of it. In particular, the supply of chocolate is not fixed (as my original condition stipulated), so it can be "inflated" to supply debt obligations. But is inflation the only solution? Can interest sustainably exist with a non-inflating currency?
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posted by jenni on March 1st, 2015 at 7:50PM

Don't lend dollars when you know there is a fixed supply of three dollars. What kind of island is this? ;) People on islands could use fruit as a commodity.

I think interest can sustainably exist as I understand it as more of a incentive for the loaner to loan out their wealth than as something to do with inflation.

posted by dennisn on March 1st, 2015 at 7:53PM

So you're saying interest can't exist on that island, using that fixed currency. (Note: bitcoin is (will be) a fixed supply currency.)

posted by jenni on March 1st, 2015 at 9:17PM

Can they divide the dollars or do they solely exist as literally three dollar bills? Either way, if there is only 3 dollars and one person owes another person two dollars they will have to make a deal with the owner of the other dollar to be able to use their dollar.

posted by dennisn on March 1st, 2015 at 9:18PM

Yes, the currency is divisble. Does that help?

I am not sure :) by jenni on March 8th, 2015 at 9:25PM.
Actually in this example it wo by dennisn on March 9th, 2015 at 5:58AM.