Hi
I’m new to bitcoin world. I have a question regarding who decides exchange rate between bitcoin and physical currency like USD.
You do.
They are your bitcoins, or your USD.
You get to decide what you do with them.
For example, I refuse to exchange my bitcoins for less than $100,000 each right now. Therefore, MY BITCOINS are each currently worth $100,000. Tomorrow, I might need some USD, and I might not have enough of them. In that case, I might decide that I'm willing to exchange SOME of my bitcoins for $4200. If I do that, then THOSE bitcoins become worth $4200.
The exchange rate is just the rate that two people agree on. Most online exchanges (such as GDAX and BitStamp) will publish the last price that two of their users agreed on, so that the rest of the world knows that there are currently people that are willing to exchange at that rate (or close to that rate). But as soon as people change their mind about the rates they are willing to accept, an exchange happens at a new price and the exchange business publishes that new price.
Can we transfer bitcoin money to physical money?
Thanks
You can exchange Bitcoins with someone that has physical money and who wants Bitcoins.