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Sorry, PM - precious metals, as in gold, silver ect.
Sometimes the "gang slang" comes through... :)

Of course I knew it would be something obvious! I think the thing about precious metals is that they aren't a disruptive technology though.

Oh, they are very disruptive too, to those who control the fiat currencies (paper money). They always have been something like a mirror that reflects the true value of a fiat currency. For that reason their price gets supressed and maniputated down, to conceil that the value of the US$ (and other paper currencies) is sinking for decades.
Crypto currencies are just another annoyance for the powers that control the money flow - simply because they are difficult to control. But they will try, I'm sure.

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