My recent post on CO2 allowances and trading actually only touched on the economics behind allowances. Since the concept of building environmental degradation into a firm's fixed production costs could be implemented a number of ways, including via an emissions tax, I thought it important to offer quick comments on why it makes sense to enact by way of a market mechanism.
There are two primary reasons to do it this way, as I see it.
1. Allows our global society to reduce emissions in a more cost-effective manner.
I'll illustrate with a simple example. Suppose GE and GM each receive 1000 emissions "credits." So whatever the units are, they can use 1,000 of them every calendar year before they are assessed a fee for overuse of the world's environmental resources. To date, suppose each has been actually using 1200 of those units.
However, GE, with its leading edge technology, is able to reduce emissions at a cost of $20/unit, while it costs GM $35/unit to do the same. So if both were to independently take action to reduce emissions, they could both become compliant to the tune of $4000 + $7000 = $11,000.
Now, let's put a market for emissions in place that is demanding $25/unit for CO2 credits.
If you're GE, you suddenly have incentive to not only become compliant, but to continue innovating and applying new technology to the business in order to emit well below quota. For example, you might lower emissions by 400 units to put you at 800 total. That way, you can turn around and sell your excess 200 units to GM a cost much lower than what they would pay to become compliant otherwise.
Instead of $11,000 being spent, the total for the two firms looks like this: (Cost of bringing GE to 1,000 units + GE profit from additional 200 unit trade) – (Cost of credits to GM) = ($4000 - $1000) + $5000 = $8000.
The same reduction in emissions is produced at about 70% of the cost. Everybody wins.
2. Companies are incented to innovate to bring emissions below compliance levels.
For the reasons already made clear the by example above, putting a market in place encourages companies to innovate in their products, processes, and business models to minimize their environmental impact and establish comparative advantage. This way, they can make a buck off of the difference and perhaps even turn their compliance unit into a profit center.
Ironically, this latter point is also one of the reasons that divvying up allowances between and within countries is so highly political. Those already at an advantage in terms of access to affordable, clean technology potentially have more to gain from such a system.
Anyhow, basic economic concepts, but interesting to explore in some detail to see how the numbers work out. I hope it's informative.
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