What would happen to bitcoin's price if the dollar crash to half the price?
Let's say 1btc=1k usd
What it the usd goes down to 50% its price?
Will bitcoin worth 2k or will it lose value?
>>1821908
Yes, 1 bitcoin will be worth 2k dollars, but it will still have the same value compared to the euro or the pound. Currencies are always valued against other currencies, not just the dollar.
BTC would double in price in USDs. It would retain it's value relative to USDs. That doesn't really mean anything though because the two don't exist in a vacuum. Best case scenario is it acts as a store of value so you don't lose any wealth when the USD crashed.
Usually when the USD weakens, most other currencies strengthen. In the simplest scenario. Any gain in BTC value as a result of a USD crash will have to take into account the stronger exchange rates to other currencies.