www.ampleforth.org )

tracks the value of 2019 USD
the quantity of ampl in your wallet change based on demand, if demand is higher and market rates are above 2019 USD value then total supply increases. The increased supply is distributed proportionately to all the existing wallets ( Anti Cantillon ) ( Federal reserve does the same thing but with cantillon effect because the increased supply is not redistributed
similarly if the demand is lower and market price goes lower than the 2019 USD then the supply is decreased globally and your wallet quantity also decrease
So if adoption of ample increase globally then the supply keeps increasing in your wallet

Ample Spot ( https://spot.cash )

Ample spot is a derivative of AMPL based on tranching concept where the price is stable at 2019 USD value and the supply does not change. So this can be easily used instead of using USDT ( Which needs a reserve and audits etc - centralised )
It can also be used for the next few years by regular farmers, super markets etc -who will find it difficult to spend 1 bitcoin to sow to harvest .8 Bitcoin later after 6 months because of deflation

As the article explains https://bit.ly/ifsatoshi - Satoshi would have made bitcoin this way if there was a clever way to peg the value of currency to CPI

In a nutshell