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If we imagine right now that 10% of the global black market economic activity occurs in Bitcoin and nobody else uses Bitcoin, it would mean $1.5 trillion in goods/services is exchanged Bitcoin per year, which would be immense. Going back to the Bitcoin = T/(M*V) equation, if M is 17 million bitcoins in existence, and we use V as 10, and T is $1.5 trillion, then each bitcoin should be worth about $8,800.