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From Wikipedia:

Ecotax (short for Ecological taxation) refers to taxes intended to promote ecologically sustainable activities via economic incentives. Such a policy can complement or avert the need for regulatory (command and control) approaches. Often, an ecotax policy proposal may attempt to maintain overall tax revenue by proportionately reducing other taxes (e.g. taxes on human labor and renewable resources); such proposals are known as a green tax shift towards ecological taxation.

The idea of ecological taxation appear to be promising - add taxes to polluting (or otherwise "environmentally expensive" products, so their price will include the cost of the product to the environment.

I want to know if there's been places where such taxes actually helped reducing consumption of "environmentally expensive" products? Did the taxation work in these cases better then other methods? (like education) On the other hand, are there cases where Ecological taxes were "abused"?

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    you seem to misunderstand the difference between the stated and actual goals of these taxes. The actual goal is to increase tax revenue, and they work for that. The stated goal is impossible to achieve as what's being taxed are things that people can't do without as there are no alternatives that aren't more expensive. – jwenting Apr 20 '11 at 8:25
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    @jwenting, you make some non-trivial claims in your comment that really need references to support. – Oddthinking Jun 21 '11 at 5:15
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    can you do without electricity for example? Or without food? Both of those are the victims of heavy 'ecotax'. With electricity this is supposedly to force you to buy "green energy" (which isn't, but that's another story) but it's impossible to generate enough of that to supply the nation, and without the subsidies paid for through those same taxes it'd be so expensive it'd be more expensive than what you have now (even taxed as it is). – jwenting Jun 21 '11 at 5:35
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    So, to summarise your argument: Actual goal is increase tax revenue [citation needed]. Stated goal is impossible to achieve [citation needed]. Ecotax is taxing items without alternatives [citation needed]. Green energy isn't green [citation needed]. You can't generate enough green energy [citation needed]. Subsidies won't cover increased prices [citation needed]. – Oddthinking Jun 21 '11 at 7:10
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    @jwenting - Not all electricity is generated by the same means. Not all food comes from the same methods and sources. This kind of taxation is meant to encourage or favor particular methods of supplying those things, not the use, period, in most cases, though, in some cases, it might encourage a certain amount of judicious use and less waste. You seem to be claiming that the goal is something other than what it is. – PoloHoleSet Nov 17 '17 at 14:38
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Ecotaxes are just one example of Pigovian taxes. The general idea is to make something with negative outcomes more expensive. The following illustration from Wikipedia illustrates this:

The workings of Pigovian taxes

In short, you can do less evil for the same price. The blue line shows the quantity/price without taxes and the red line with a Pigovian tax. Tax revenue (gray) is also generated.

To answer your question, it's quite easy to find academic papers showing the effectiveness of Pigovian taxes. For example:

Analysis of a well-composed program for Mexico City indicates that the emission reductions would cost 24 percent more if a tax on gasoline was not introduced.

This paper attempts to integrate the theory of optimal taxation with the analysis of the use of indirect taxation to counteract negative external effects (Pigovian taxes). A first-best solution to the problem of the optimal tax on an externality-generating good is contrasted with the case where the government also needs other, distortionary taxes in order to satisfy its revenue requirements. The main result is that the Pigovian principle holds in a modified form in the latter case as well.

However, according to Fullerton and Wolverton, a Pigovian tax is equivalent to a combination of presumptive taxes (that affect everyone) and environmental subsidies (to those that act more environment-friendly). The claim is that the two-part tax instrument is easier to enforce and enact in some cases. I'm guessing it would be appropriate for production taxes, while a simple Pigovian tax would be more effective for consumer goods.

This paper builds two simple general equilibrium models to demonstrate the equivalence between the Pigovian tax and the combination of a presumptive tax and an environmental subsidy. [...] Compared to the Pigovian tax, a two-part instrument may be easier to enforce, may be easier to enact, and can still force the market to recognize the social cost of disposal.

Summa summarum: there is evidence that Pigovian taxes in general and ecotaxes specifically have been and are effective. They aren't the only possible solution, and not always the most effective one.

(all the fulltexts are behind paywalls, sorry for that)

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I think there's a bit more recent evidence from the UK that Pigovian taxation does achieve the intended effect The UK has a £23 tax per tonne of carbon that "tops up" the £5 EU one (I'm oversimplifying that last part since the EU approach is a cap and trade scheme.) But anyway, the result in the UK:

The fresh research shows that Britain has climbed from a 2012 ranking of 20th out of 33 industrialised countries to 7th on the low-carbon electricity league table.

“Britain is reducing its carbon emissions from electricity faster than any other major country, and this has happened because the carbon price and lower gas prices have forced coal off the system – the amount of coal-fired power generation in Britain has fallen 80pc between 2012 and 2016,” said Dr Iain Staffell, from Imperial College London.

While coal generation has fallen in the UK, Dutch coal-[f]ired power plants have ramped up due to sluggish European carbon price, causing emissions in the Netherlands to rise by 40pc between 2012 to 2016.

The Dutch coal mistake is supposedly goig to be rectified by 2030, according to the latest news using the more traditional means of closing plants down, which is basically a capping scheme.

And the UK's is more or less a repeat of the Norway story (except for the exports bit):

Norway has had a carbon tax since 1991, roughly $72 per metric ton for the offshore oil and gas industry (rates vary by industry). At the same time, the country banned the practice of burning natural gas that comes up with the oil—all the CO2 for the atmosphere with none of the energy benefits—known as flaring. And, thanks to the tax, Norway hosts the world's largest CO2 storage project at its offshore Sleipner natural gas field, where millions of metric tons of CO2 have been pumped under the seafloor rather than dumped in the atmosphere. "We are by far the most carbon-efficient producer of oil and gas," says Hege Marie Norheim, senior vice president for corporate sustainability at Norway's state oil producer Statoil.

But a carbon-efficient oil and gas producer is still an oil and gas producer, which shows that a tax on carbon—even a relatively high one—is not a panacea. Since 1991 Norway has exported more than 16 billion barrels of oil. Each barrel meant 430 kilograms of CO2 entering the atmosphere when used. So Norway's oil production has added nearly eight billion metric tons of CO2 to the atmosphere when used after export to other European countries.

This is the problem of leakage: Norway's carbon tax stops at Norway's borders, unlike its oil exports.

Alas it's probably very difficult to find a comparative study of the alternatives (to Pigouvian tax) which isn't theoretical/hypothetical... you can't turn back time and most of these polluting industries have large costs so experimental economics is generally out of the question.

From a popsci account, Pigouvian taxes and cap-and-trade have exactly the same outcomes, but only under certain idealized circumstances. Uncertainty over the price affects cap-and-trade but not the tax system. Conversely the capping guarantees a maximum pollution level, whereas a tax system does not. Furthermore, the cap-and-trade allows "grandfathering" of industries by giving them a partially free pass initially. However cap-and-trade deprives the government of some immediate revenue. Some hybrid schemes have been proposed as well, with a price floor and/or ceiling, but these have their own problems, complexity being one obvious. (For more details on these [theoretical] comparisons, see these Berkeley course slides for instance.)

On thing that is known experimentally (and coincides with common knowledge) is that offering Pigou subsidies is better from a psychological acceptance standpoint than imposing Pigou taxes, especially under partial information. For instance when a government subsidizes clean/renewable energy, it's offering a Pigou subsidy.

There is however a subtle effect of relying only on [Pigou] subsidies for renewable energy (or in general alternatives). From a theoretical study:

Permanent renewable energy subsidies are not only an expensive choice to reduce emissions. They are also a very risky instrument because small deviations from the second-best optimum lead to strong responses in emissions and welfare. If the subsidy was set 2% below its optimal value, emissions would increase by 18%. In contrast, if the subsidy was set 2% above its optimal value, welfare would decrease by an additional 3% due to an over-ambitious emission reduction.

I'm not sure what changes in behavioral rather than classical economics account of externalities. I found one fairly recent study proposing that

Traditional policies to promote cooperation involve Pigouvian taxation or subsidies that make individuals internalize the externality they incur. We introduce a new approach to achieving global cooperation by localizing externalities to one's peers in a social network, thus leveraging the power of peer-pressure to regulate behavior. The mechanism relies on a joint model of externalities and peer-pressure. Surprisingly, this mechanism can require a lower budget to operate than the Pigouvian mechanism, even when accounting for the social cost of peer pressure. Even when the available budget is very low, the social mechanisms achieve greater improvement in the outcome.

It's hard to tell how something like that translates to a big scale like in a country or between countries. Uncharted waters. However countries putting political (and ultimately military) pressure on others is not unheard of... so who knows, maybe it applies.

They do mention some (obvious) caveats: like "negative peer pressure may result in retaliatory action, especially when it is perceived as illegitimate, a phenomenon that has been observed across many cultures. Thus, peer enforcement can turn prohibitively expensive if peer pressure ends in a chain reaction of retaliation." Vendettas and so forth. And a "second caveat is that the success of peer pressure relies on effective monitoring of peer action".

And in the same behavioral corner, there is a very recent experimental paper proposing that education/information is effective in producing voluntatry substituions to cleaner alternatives. They provide a quantifiable comparison between education/information and a Pigovian tax in a certain experiment involving consumer decisions in a supermarket setting. (I'll have to read it beyond its abstract to say more, and it's a pretty long paper.)

  • There's 2009 dissetation that experimetnally tests some Pigovian assumptions in game theory, but it does involve ecotax(es). I'm not sure it's worth getting into the details of that here. – Fizz Nov 17 '17 at 4:00
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    wrt "On thing that is known experimentally (and coincides with common knowledge) is that offering Pigou subsidies is better than imposing Pigou taxes, for obvious psychological reasons, especially under partial information." -- "is better" is an awfully strong (and also vague) statement, when what you really mean is "is easier to sell people on". – Ben Barden Nov 17 '17 at 16:03
  • @BenBarden: Yeah, that's a good point. I had not yet found & read the paper from the next paragraph when I wrote that. The (vague) "better" begged the obvious question why anyone would bother with Pigou taxes if subsidies were better in every way. – Fizz Nov 17 '17 at 21:10
  • The change helps, but I'd still say it would be improved by removing the word "better" altogether. Something like "More easily gain public acceptance" might be... better. – Ben Barden Nov 17 '17 at 21:35

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