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One important characteristics of money is that it is generally accepted by every one in the community or society but bitcoin is not yet known by all the people. Bitcoin is still struggling to go to people's accepting it, it is still very volatile and money isn't. I think that we can look bitcoin from area that it is digital currency purpose.
You are wrong, bitcoin is accpeted by people, that is why its realized cap is increasing, which society does not accept bitcoin when it is even used in countries that ban it, while most countries legalized it. Is it volatility that also matters or depression? Fiats are just depreciative assets while bitcoin is appreciative in nature. Bitcoin is a successful currency already.
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It is legal to more countries than in countries wherein it is not. But the fact that majority of the countries are "neutral" into it, meaning, are not in full support, he has quite a point. Comparing fiat and cryptocurrency, ofcourse fiat is more widely used because it is generated by each government to serve as a mode of payment. Bitcoin is appreciative in nature, indeed, but is not having consistencies regarding its market price due to its volatile market value. I do agree with Bitcoin's success as a currency among its competitors in this industry but it still needs further development. Coexistence is more likely to happen than Bitcoin alone in the future, IMO.