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Arnold, can you provide us with a link to this debate you're talking about. I don't remember it and would like to read about it. Thanks.
David,
Just Google
Kling Krugman oil speculation
Of course, we all know that over the past year the marginal cost of drilling a new oil well rose from under $100 to almost $150, fell back to under $100, jumped back to almost $125 and than collapsed to under $90.
thank goodness we had speculator that dampened such wild volatility and prevented the price from deviating from the marginal cost of drilling new oil wells.
Isn't this what you teach your introductory student when you explain that markets are never wrong?
Of course, we all know that over the past year the marginal cost of drilling a new oil well rose from under $100 to almost $150, fell back to under $100, jumped back to almost $125 and than collapsed to under $90.
Your "critique" makes no sense, spencer. "The marginal cost of drilling a new oil well?" You make it sound as though there is no price elasticity of demand for oil, and that all oil wells are the same. There are always many possible places to drill (or expand, or inject seawater into) an oil well with different expected marginal (and average) costs per barrel of oil produced. The price of oil drives which investments in oil wells look profitable; the price of oil is driven by expected future demand and expected future supply. It is indeed quite possible that changes in the expected future demand meant that the expected cost of marginal barrel of oil where the future supply and demand would intersect could have shifted wildly.
Krugman was claiming that prices for oil are only determined by immediate short-term demand and short-term supply, and that short-term supply is essentially fixed, that oil wells pump out everything that they can right now.
Kling, Cowen, and others were arguing (and I agreed) that the price of oil depends on future expectations of both supply and demand, not just the immediate short-term situation.
spencer, if we are actually running out of oil, then speculators driving the price up is a good thing. I certainly wouldn't claim that "markets are never wrong," but the markets do a lot better job of convincing people to conserve than government.
If short term oil supply is fixed, and if short term oil demand is also fairly inelastic, couldn't small changes in the demand curve cause huge swings in price?