Knubic is redirecting to http://www.quora.com/The-mining-difficulty-of-Bitcoins-increases-as-time-goes-on-As-a-consequence-costs-electricity-etc-will-increase-Is-there-any-incentive-to-mine-the-very-last-remaining-Bitcoins-if-the-exchange-rate-stays-below-a-certain-point
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