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I knew sooner or later someone would write this paper

Yes Pigou taxes can possibly have counterintuitive results:

Judged by the principle of intertemporal Pareto optimality, insecure property rights and the greenhouse effect both imply overly rapid extraction of fossil carbon resources.  A gradual expansion of demand-reducing public policies -- such as increasing ad-valorem taxes on carbon consumption or increasing subsidies for replacement technologies -- may exacerbate the problem as it gives resource owners the incentive to avoid future price reductions by anticipating their sales.  Useful policies instead involve sequestration, afforestation, stabilization of property rights and emissions trading.  Among the public finance measures, constant unit carbon taxes and source taxes on capital income for resource owners stand out.

Here is the full paper, here are non-gated versions.

The point is this: carbon taxes drive down the net post-tax price which fossil fuel suppliers receive; in fact the resulting transfer of wealth from the Saudis to the U.S. is a common argument for such taxes.  But the lower net supply price is not in every way a blessing.

One possibility is that at the new and lower (supply) price, other (non-Pigou-taxing) countries will buy more fossil fuels, picking up some of the slack and counteracting the carbon taxes at the global level.  This effect is strongest for low marginal cost oil.  If Americans buy less oil but all the oil will end up sold in any case, demand simply has been redistributed rather than lowered.  Instead the key is to get that oil to stay in the ground.

Second, at a lower supply price the intertemporal Hotelling resource extraction problem is tricky rather than straightforward, again especially for low marginal cost oil.  Lower (supply) prices today also mean lower (supply) prices in the future, so, after a tax is imposed, the time path of extraction can easily tilt toward the present rather than away from it.

Note that the higher the (posted) oil price goes, the lower are extraction costs relative to price and the more likely these counterintuitive results become a potential problem.  In 2006 average extraction costs were only 15% of the average spot price.  Obviously if extraction costs are high the lower net supply price to the producer does keep the stuff in the ground.

Further counterintuitive results can arise if market players expect a Pigouvian tax to rise over time.  A (politically impractical) alternative is to make the tax very high today and lower it over time.  We are more likely to do the opposite.

The bottom line is this: paying countries to blow up their oil fields may be more effective than taxing the resource.  (TC: don't some people volunteer to do this work for free?)

Empirically, I still suspect that the "naive" first-order demand side effects predominate.  But if you want to know all the ins and outs of Pigou taxes, it's worth spending some time thinking through these problems.  Taxing intertemporal resource stocks doesn't always lead to simple, predictable results.

Posted by Tyler Cowen on September 29, 2007 at 06:27 AM in Economics | Permalink

Comments

John Robb talks about a "terrorism tax", the extra costs to run a city because of the risks of terrorism. Countries' oil industries also have to pay the terrorism tax.

The level of that tax is mostly set by the terrorists and their sponsors, not the governments where the oil extraction or use takes place. Could sponsoring attacks on the oil industry in low-cost countries be a cheap way to get the effects of a Pigovian tax?

Posted by: Don Marti at Sep 29, 2007 9:36:53 AM

Along the lines of the previous poster:

A lot of people seem to think that the current Iraq war was/is about oil, and you can see signs at rallies such as no more blood for oil. Presumably they think that we have cheaper oil because we invaded Iraq, or at least "we" (i.e. Cheney etc.) thought we would have cheaper oil. This couldn't be more wrong, or at least the former assertion.

The net result of the invasion was to knock out a huge marginal supply of oil off the world's oil markets. A conspiracist might say this is precisely why there was no follow up plan on how to peacefully run the country after the Iraqi army was defeated.

Therefore one could say that the Iraq war has been an environmentalists dream, a huge Pigouvian tax of tens of dollars per barrel of oil, one that will likely last for some time, indeed it has already lasted for some time. (Not to mention all the dead people who can no longer emit nasty GHG's). Of course the tax receipts are going to the Saudis, Kuwaitis, and Cheney's other friends instead of the US (and the world's) treasury. But less carbon gases have gone into the atmosphere than otherwise would have been in the absence of this war.

Therefore Bush has done more to slow down global warming than anyone else!!!

Posted by: happyjuggler0 at Sep 29, 2007 10:33:56 AM

"average extraction costs were only 15% of the average spot price"

Hmmm, isn't this blog called the "marginal revolution"? What matters is what happens on the margin on the average.

There is lots of expensive oil being drilled for now, e.g. deep sea, oil shale, tar sands, stripper wells, etc If we tax carbon, then demand falls and the price ON THE MARGIN for suppliers falls. That makes these marginal supplies uneconomical and they stay in the ground. Result, less global warming.

Furthermore, if taxes are phased in moderately quickly, e.g. within 10 years, then long term development of high cost fields will also be discouraged.

Think on the margin, Tyler :)

Posted by: A student of economics at Sep 29, 2007 11:45:55 AM

This is why I like economics.

Posted by: Kyle Moore at Sep 29, 2007 11:55:26 AM

In France taxes represent 65,8% of the price of gasoline (about 20% goes to producer, and 15% to refining and selling - those 15% are taxed again).

A few years ago a "floating" tax was introduced to keep gasoline prices more or less constant when crude price was going up. This floating tax is currently inactive.

Not far from optimal, France the country of optimal economics policy (and did I mention health care ? :).

Posted by: Laurent GUERBY at Sep 29, 2007 12:10:11 PM

The grand example is the Soviet collectivization of agriculture: a 100% tax on your land and your agricultural capital stock *next year*...

Posted by: Brad DeLong at Sep 29, 2007 12:29:46 PM

Isn't there also the problem that taxing people who pollute could have a similar effect as paying Yana to do chores had? I'm in favor of Pigouvian taxes, but this issue concerns me.

Posted by: Maestro at Sep 29, 2007 2:17:27 PM

Higher fossil fuels taxes imposed today delay attempts to extract it to the future when technological advances will lower extraction costs so that even with taxes the oil becomes economical to extract.

But higher taxes imposed on oil today also spur technological developments today to develop cheaper non-fossil fuels sources of energy. So higher fossil fuels taxes might also decrease the odds that various deposits of oil, natural gas, and coal will ever be extracted.

But the passage of time also brings technologies that lower the external costs of using fossil fuels and therefore reduce the need for taxes that prevent fossil fuels extraction.

Also, imagine that fossil fuels taxes could be imposed on two different economies. One has a smaller population with a much higher per capita GDP and the other has a bigger population with a much lower per capita GDP. Total GDP is equal between the two populations. My guess is that a fossil fuels tax on the smaller higher per capita GDP population will yield more technological advances for non-fossil fuel energy sources because the higher per capita GDP country has a much greater capacity to generate new technologies.

The larger point here is that the effects of fossil fuel taxes on rates of technological advances might turn out to be more important in the long run than other effects of fossil fuel taxes.

Posted by: Randall Parker at Sep 29, 2007 4:30:52 PM

2 points:

1. I have for years been thanking the Europeans for helping to make gasoline cheaper for me with their taxes.

2. Some gasoline and diesel fuel is now made from tar-sands. Fuel production from tar-sands is close to marginal and making tar-sands into gasoline and diesel fuel puts more co2 in the air than making fuels from light crudes. Same for coal to liquid.

Interestingly the people who say that Americans are buying too much petroleum from the middle east cite the percentage and then often suggest policies (like conservation) that would increase the percentage of our fuel that comes from the middle east (the cheapest petroleum to get and turn into fuel comes from the middle eat).

I think that any carbon tax should pay out to those remove co2 from the air. I think biochar is a promising way to do this cheaply.

Posted by: Floccina at Sep 29, 2007 6:07:54 PM

" policies (like conservation) that would increase the percentage of our fuel that comes from the middle east (the cheapest petroleum to get and turn into fuel comes from the middle east)"

Yes, but conservation would reduce the rents that those regimes get by billions of dollars by lowering the equilibrium supply price. That's the point.

Posted by: A student of economics at Sep 29, 2007 8:29:34 PM

"paying countries to blow up their oil fields may be more effective than taxing the resource. "

If the oil fields are blown up, then the rents to other oil producers would go up.

If the oil is taxed, then the revenues go to the U.S. and other consuming nations governments with taxes, allowing them to fund programs and/or reduce other taxes.

For an equivalent increase in price, and drop in consumption, I think the have the consuming nations get the money is very much preferable.

Posted by: A student of economics at Sep 29, 2007 8:34:11 PM

中国呼吸网 肿瘤网I have for years been thanking the Europeans for helping to make gasoline cheaper for me with their taxes.

Posted by: ff at Sep 30, 2007 4:13:28 AM

I thought these and other potential efficiency problems with domestic carbon taxes were well understood. That is why the IPCC, Nordhaus, and so on say we need global prices arrived through coordinated global instruments.

Posted by: aaron_m at Sep 30, 2007 4:22:49 AM

"conservation would reduce the rents that those regimes get by billions of dollars by lowering the equilibrium supply price. That's the point."

Will their rents really be reduced very much? Will the strategic importance of Mideast oil be changed at all?

First, any gasoline tax will have to be extremely high in order to have a large effect on U.S. demand. It is unlikely that Congress can muster the political will to pass a large gasoline tax.

Second, if reduction in demand by the U.S. does occur, the new equilibrium price will be just barely changed. Developing nations will simply demand more as prices drop.

Third, the important point is that any reduction in worldwide demand reduces marginal supplies, not Arab supplies. As Floccina pointed out, if slightly less worldwide oil is consumed, the importance of keeping Mideast supplies flowing will be even larger.

The final effect of increasing gasoline taxes:

- delays in developing alternative energy sources;
- increased importance of Middle East;
- massive hit to the U.S. economy as we adjust to new taxation;
- very tiny drop in carbon emissions.

Posted by: John Dewey at Oct 1, 2007 7:13:35 AM

I didn't think the point of oil taxes was to keep us from drilling the stuff. Am I missing something? This is only true if our net consumption of petroleum is taken to be an unalterable constant. I do not think that is true.

Posted by: perianwyr at Oct 1, 2007 8:23:30 AM

Sadly, this paper is an example of a very good economist not really paying much attention to the rest of the field. Climate policy is primarily about coal, not oil. Even at 3 times Nordhaus' optimal carbon tax, the tax on gasoline right now would be about 25 cents a gallon, and it wouldn't rise even to a buck a gallon for decades. In the meantime, the tax doubles the price of coal, so we'd use up most of the cheap oil and cut way back on coal use. Over that kind of time frame, the important thing is to divert research away from finding ways to extract oil that's increasingly hard to get at and toward finding ways to make non-fossil energy cheaper. And in the meantime, coal is just a very different animal than oil - it's essentially a constant-cost commodity, so the author's insights dont' really apply very well. So while the author does some very good economics, it just isn't very relevant to the problem at hand.

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Posted by: Bob at Mar 14, 2008 3:21:26 AM

I realize this is an old thread. But I've already commented twice in a row at the one that linked here, so rather than looking like even more of a jerk...

The problem is there is NO marginal problem with carbon dioxide. Here's the deal. If there is a marginal problem with CO2 then there is no problem. There is no economic problem with CO2. There is only a problem with CO2 if there is a physical feedback phenomena, a la "The Day After Tomorrow." I doubt there is such a catastrophic feedback scenario. The world is remarkably homeostatic.

Therefore, there is no marginal economic problem. Here's what I mean by this. Right now, "we" are proposing to create a lot of known problems in order to stave off unknown CO2 "problems." But, we don't actually know beyond a shadow of a doubt that these problems will come to fruition. And, if there isn't a feedback problem as mentioned above, then the CO2 problem will be marginal. And, if it's marginal, we will have time to correct it once the damage becomes apparent.

If we address the problem now, the cost of the prescription may be higher than the disease. The prescription will definitely cause loss of worldwide wealth, and may not prevent global warming. Regardless of what we do, we'll waste a lot of energy arguing about it.

Go read or go to TED and watch Aubrey de Grey's talk on anti-aging, bear with me. He says that gerontology (preventing degeneration) stinks because we are trying to fix metabolism. That's hard. Evolution did a pretty good job. He says that geriatrics (treating disease) is hard because the damage is already in the complex positive feedback domain. He says the solution is to address the known damage when the damage happens. Unlike the other two approaches, this is doable. This is my analogy for global warming. We know what we think will be damage. We need to wait to see it and address the causes of the damage.

Oh, and we're better off spending money to fight aging than to fight global warming :)

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