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Warren Buffet didn't invest in bitcoin, but a gold mining company (by extension Gold), but I get your point and how bicoin comes in, in all of these, after the Grayscale/MicroStrategy big news and how it was affiliated with bitcoin, one thing could be certain and it's that there's going to be a gradual movement from fiat to assets that can stand inflation and ward off devaluation.
I think, as I understand Buffet investing, he invested in mining because it’s literally the industry most correlated with gold prices, not because of the mining per se. He said over the decades doesn’t consider commodities for his investment, as buying something and waiting for a price appreciation is not true investment. So he wanted a true business providing a steady dividend flow AND correlated with gold prices prices.
That being said, talking about assets that can ward off inflation, Gold will come to mind first, but the next asset I'll think about is bitcoin, though it's still a long way before Bitcoin can be technically a safe haven, but it's in that phase to becoming that, bitcoin is doing good things this year, and this evolutionary step will continue and end up in bigger things.
A few months ago, in the infamous Goldman Sachs presentation about bitcoin, they showed in case of “normal inflation� equities are a better hedge than gold. In this sense I think a bitcoin related equity (MicroStrategy is the only one I can think about right now!) are a better hedge, under Warren Buffet parameters he CURRENTLY use to invest.
Bitcoin mining is maybe the most competitive industry on planet Earth. I guess it’s not a good industry to invest into.
The point is: how long can Buffet ignore the true point, and avoid buying bitcoin directly? When he will have to capitulate and accept the fact Bitcoin will be the new investment parameter?