Now we see why the USA moving towards crypto and they created new dollar the USDC and USDT and other stablecoins to make sure people have a lot ways to adobt dollar.
If eur and gbp will be out of the pictuere then imagine dollar purache power..... it's like 1000000% value.
You are mixing too many things up here, what's the business of GBP with the USD if it goes extinct (which will not happen)? What if they align with another currency like EUR? The dollar value will of course remain as it is. However, so long as there is the UK, there must be a currency linked to it and that can never be the USD, so what's the correlation?
As for the allegation that the USA is moving towards the digital version because of the stability of the USD, you are very wrong, if such a thing is the reason, they would have achieved it years back. Is it not the negative impact on the prevailing digital businesses they are worried about which delays its implementation? Read your news.
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You better stack up the dollars

dollar is now like ico you get in early
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I disagree with you, the condition of the USD can't be outrightly predicted, except for a bad economy like that of my country, the USD always wins...lol. Generally, the USD is a good currency but one should learn how to speculate for the risk appetite time (when you dispose your USD for the risk-on assets) and the risk aversion time (when you need the USD for safe haven purpose).