These can be changed after deployment by governance.
It’s up to governance how they want to set these. It’s possible to leave one or both of them at 0% depending on the size of the debt ceiling. I’m guessing we probably won’t want to set the fees both to 0% as your bracket equation is correct as long as there is debt ceiling or liquidity available to go either way.
This is correct.
This is essentially the case where Dai is trading above $1.01 USDC (not USD). In this case free money is available, and the price will be arbitraged until it reaches $1.01 again (or the debt ceiling is reached).
Yes this would be more against short term price shocks in the other way. Definitely if we sustain a price of < $1 the PSM will clear out quickly and we need to move onto Stability Fee price regulation after that same as before. That being said, this is the case where the
tout is set to ~0%. We could increase that if we want to maintain a pool of USDC for extreme price shocks in the other direction. These are all options available that need to be discussed. It’s not really my place to comment on what the fees will be. I’m just putting the code out there.