Investors and debtors will want inflation.
Creditors will want deflation.
You are right, that is undoubtedly their self-interest, but I believe they mostly cancel each other out. Creditors will lend 100 coins and vote for maximum deflation, then debtors will spend/invest the 100 coins and vote for maximum inflation. Debtors get another chance to vote with 100 or more coins when they pay the creditor back but this offset by the higher than average probability that the money sent from creditor to debtor had more confirmations than the money sent from debtor to creditor.
Even with demurrage, money holders will want their money to appreciate.
And yes miners will want more subsidy, even if it will be translated in more competition later (that neutralize their increased profits), that won't be instant, the increase in the subsidy would happen first.
I guess you are right. What if the demurrage rate were inversely proportional to the supply growth rate? That way money holders have no incentive to push for deflation because it will translate into increased demurrage and miners have no incentive to push for inflation because it results in less revenue from demurrage.
About the concrete voting system, I would suggest to define a
reference currency and the people vote how higher or lower the chain currency is compared to the reference.
Yeah, I had Terra in mind when I suggested to follow a price index for the recommended/default rate, but I get the vibe you mean create a real parallel blockchain just to set the reference. I don't see the need for that.
EDIT: I read your thread more carefully and it looks you didn't mean real currency that's actually issued, so we are on the same page.
And the system could ignore very extreme votes or the ones that are vey different from the rest.
But wait, miners can leave out the votes they don't like.
Yeah, I suggested ignoring extreme votes on post
#3. You are right about miners being able to boycott votes but I believe accepting the transaction fees would be more profitable most of the time, especially if demurrage is transaction based like maaku wants to implement. Also if I'm correct about removing bad incentives for miners with the demurrage rate as a function of the supply growth rate then there's nothing to worry about, they would just ignore transactions with votes that deviate from price stability.