It was an old average number a year ago, could be around $5000 now but it’s a guess and some calculation research from lots of articles.
Also institutions want to buy bitcoin lower and there time may come shorty so they can sell high in 2020.
My estimate would suggest it will cost like $7000-$8000 to mine bitcoin after the halvening. But what do I know, I’m just a STEEMIAN lol
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