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than done, of course.Re Stepehn's paragraph 3, this is the usual pattern of economic substitution for an increasingly expensive product. For some uses, there are relatively cheap alternatives and for others the alternatives are more expensive. A scarcity signal (rising price) causes demand destruction in the short term, followed by a move to alternatives in the longer term. No problem from a systemic risk POV, unless we have got ourselves into a situation where we can't afford to invest in alternatives, or we don't have enough time before production crashes completely -- neither of which is the case.