Ok, let's switch from the disease to your proposed cure. How would this demurrage work?
Like a negative interest on cash.
http://en.wikipedia.org/wiki/Demurrage_(currency)
Who collects it?
The issuing authority. For Gesell's free-money, the state. For local currencies like the later prohibited
Wörgl miracle, to the city. In the modern
chiemgauer I think it goes to non profits, but there's more regio currencies in germany.
In the case of freicoin, it goes to miners.
How?
With paper money is typically implemented through stamps that you need to stick to the bills for them to continue being valid.
For freicoin, you just change the way you look at balances. When you want to know the balance of a given address you look at the amount that is written in the chain, the block number in which it appears and substract the demurrage fee per block.
That money gets destroyed. Miners count on a perpetual constant reward but eventually the new money created equals the money destroyed by demurrage and the monetary base gets stable (morestable than bitcoin's because you also recycle lost wallets with this). That's why I say that the fees go to miners.
What do they DO with the demurrage fees?
Public institutions: take it as a tax.
Miners: take it for the security service they provide. They will be able to provide more security with less transaction fees so in certain way it also goes back to the users in the form of lower tx fees. This would also solve the "transaction fee tragedy of the commons" if it happens to occur with bitcoin when there's no other reward for miners.
And (perhaps most importantly) how is the "appropriate" demurrage price determined?
That's the hard one. Ideally you want to equal the basic interest with the demurrage rate, but what's the natural basic interest?
Gesell estimated it around 4% or 5% based on historic data, but have other improvements in commerce lowered that figure?
I guess the best solution would be to have different currencies with different demurrage rates and let the market decide.
Borrowers will prefer high demurrage rates to lower their borrowing costs but lenders won't accept less than 0% interest.
And how is it really any different from an inflationary money supply?
Yes the wey they affect interest is different. The inflation is added to the inflation premium of the gross interest so you don't really lower interests.
Let's compare freicoin with expocoin/inflatacoin bouth at 5% demurrage/inflation.
Let's say we have some real capital (say a house) with zero risk that yields y% anually and costs 10000.
You're a lender with 10000...
10000 inflatacoins
You ask me borrower at least y + 5 % or you just buy the house.
10000 freicoins
You just ask me for y% because the house is not expected to rise in price 5% anually.
Doesn't it necessarily rely on the supposed intelligence and benevolence of a centralized authority (and thus won't it fail for the same reason as the Federal Reserve system)?
That's only necessary if you want an elastic supply. Anyway, a central bank issuing money with demurrage would have much more control over the price of money because V would be not only greater (which means a smaller increase or decrease in the base will affect more and faster) but much more predictable. Current central banks just can't control the price of money even if they were benevolent.
But the power of a free-money central bank could also be abused.