take some gold coins
take some bitcoins
go to cuba, spend, and get back to us
go to china, spend, and get back to us
go to the mall, spend, and get back to us
go buy some pussy, and get back to us
bribe the border guards between Ecuador and Peru, an get back to us
tell us which "currency" works best
Bitcoins are a construct instrument of one type of civilization in one short time span, just as credit default swaps, SPDRs, naked puts, or corn futures. They rely on agreements to have value.
Gold, you don't need theories. Civilizations collapse, empires fall, and gold endures.
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