Imagine if you could only buy bread with crypto, and some billionaire buys a large amount of crypto the night before, the next morning your bread will cost twice as much.In other words its a rare resource, basing prices on crypto doesn't make sense.
If you can buy bread with crypto, let me use bitcoin as an example, the store will not set the price in btc, if it's a country with a dollar fiat system, the price will be set in dollars, you then as a customer can decide to pay then in bitcoins, when you convert the fiat value to btc. Also if the billionaire buys a large amount, that will appreciate the price of btc, and your own coins will increase, so you'll be paying a lesser amount for the bread the next day
, that being said, prices of goods are not based in crypto just yet, except in bitcoin communities, like this forum and few other places, only mainstream adoption can make It possible.
unless governments just make digital cash for us, that doesn't jump too much.
Governments already are in motion to create their own CBDC, but it is not going to be like bitcoin or even any other decentralized digital currency, it's just going to be a revamped centralized fiat currency, so don't be too expectant, i'm not btw.