I have actually thought about this for in the future. This will be a very tricky metric. And I honestly don't know what the answer will be. Going to need someone far more intelligent than I to answer that question.

Once Sats are the medium of exchange for everyone in the world, those Sats will gain value on a daily basis depending on how much value the world created. Bitcoin will have to encompass that value. Like I said, a very tricky metric. I am not sure how we would measure that.

However, we are still in the very early stages of adoption. We are no where close to having to wrangle with that issue as of yet.

Right now, we are still measuring Bitcoin's monetary value in Dollars, or whatever national currency you use. Unless you as a business want to go in and change your prices on a daily, or even hourly basis (God candles) then I would suggest charging a firm fiat price that is denominated in Sats, and only accept Sats.

Perhaps someone has a better idea, but that's just my 2 Sats.