The way I would see a hypothetical solution work is to target price stability directly through some kind of supply/demand mechanism - that is, add a way to create currency units at a few percent above some target rate and a way to destroy them at a few percent below it. Somehow integrating computer power rental into the network is as close as I can think of, although that does give you a very high inflation rate of Moore's law. Another possibility might be velocity - look at the average age of unspent outputs (or, better yet, something like the sum of the inverse of the age over all coins, so lost coins automatically approach value zero) and add more currency units if it looks like things are going too slowly, but you would have to think long and hard to ensure that that's not gamable. It's an interesting unsolved problem, I admit.
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The way I would see a hypothetical solution work is to target price stability directly through some kind of supply/demand mechanism - that is, add a way to create currency units at a few percent above some target rate and a way to destroy them at a few percent below it. Somehow integrating computer power rental into the network is as close as I can think of, although that does give you a very high inflation rate of Moore's law. Another possibility might be velocity - look at the average age of unspent outputs (or, better yet, something like the sum of the inverse of the age over all coins, so lost coins automatically approach value zero) and add more currency units if it looks like things are going too slowly, but you would have to think long and hard to ensure that that's not gamable. It's an interesting unsolved problem, I admit.