If the owner of a store decide received only Bitcoin how payment of his products, how him can define the prices without forget of volatility of Bitcoin?
I think there are now some applications that can immediately convert the Bitcoin into fiat money as soon as the fund arrives. This way, the merchant can be protected by sudden retreat in value though if there would be a surge he could be very much happy to receive the increase in value. I also heard that more and more applications along this line so that we can encourage more and more merchants to accept Bitcoin and make it truly mainstream.