Re:Proof of Stake
by Spivak on Sunday November 20, 2016 @09:09PM
(#13002542)
It also helps facilitate transactions, ensures the security and integrity of a network of mutually distrustful agents, and establishes a price floor for the currency loosely based on the price of electricity.
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"establishes a price floor for the currency loosely based on the price of electricity."
You have causality backwards: the difficult changes based on the price of the currency. If the price goes down, people will simply mine less.