There have been some heated discussions around the mint and burn fee’s on the forum.
One thing that is not totally clear to me is why one would raise the burn fee instead of the mint fee.
The purpose of this post is to gather the motivations around this, mainly for my own understanding.
Let me try to explain how I’m currently thinking about this.
First some facts that will necessarily hold:
- Any asset that is burned has by definition been minted
- While every asset has been minted, not every asset will be burned (assuming TVL never reaches 0)
This means that, all things being equal, an increase in the mint fee has the same, or even better, effect on the total fees generated as an equal increase in the burn fee.
The only time this does not hold is when TVL > 0 when the fee change is made, and in a particular period burning volume > minting volume. In such a scenario, increasing burn fee yields a higher total fee at the end of said period than an equal increase of the mint fee.
However, this only holds for as long as burning is greater than minting.
The other thing to consider is the TVB/TVL ratio, and the role that the fees play in keeping the ratio favorable.
Without going in to this too deeply, the way I think about this is that it is always better to have a relatively low burn fee to not dis-incentivize burning, and to keep burn-and-mint transactions economical.
One argument that has been made is that it is good to keep the burn fee at a “high” base level so that we can lower the fee later to incentivize burning when we need to lower the TVL. This however suggests that there was a pent up burn demand which I think should be avoided in the first place.
This means that the main lever to control the ratio will be the mint fee.
Lastly, the only other thing I can think of is psychological on the UX side. Where a 20 bps fee now and another 20 bps later (when burning) feels smaller than 30 bps now and 10 bps later. Also the UI might just show the mint fee when minting and the user might not know about the burn fee.
But I tend to think that because most of our volume comes from high value transactions, they are more sophisticated users that are not fooled by this
Long story short, I don’t really see a compelling reason to increase the burn fee when we can increase the mint fee instead.
Thanks for sticking with me so far, would be great to hear some more thoughts around this.