And my 2 bits worth: We already have a global virtual currency -- the US dollar. The Fed Chair, with a mere computer entry, controls supply, value, etc. You can use it to pay taxes (US), easily convert it into other currencies, and exchange it for any commodity or service in the world. Are there competing virtual currencies issued by other "central banks?" Yes, and someday one of them may supplant the US dollar, but Bitcoin will never be a playa.
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