Carbon Tax - Carbon Taxes Compared To Cap-and-trade

Carbon Taxes Compared To Cap-and-trade

See also: Cap-and-trade

An alternative government policy to a carbon tax is a cap on greenhouse gas (GHG) emissions. Emission levels of GHGs are capped and permits to pollute are freely allocated (called "grandfathering") or auctioned to polluters. Auctioning permits has significant economic advantages over grandfathering. In particular, auctioning raises revenues that can be used to reduce distortionary taxes and improve overall efficiency. A market may be allowed for these emission permits so that polluters can trade some or all of their permits with others (cap-and-trade). A hybrid instrument of a cap and carbon tax can be made by creating a price-floor and price-ceiling for emission permits. A carbon tax can also be implemented concurrently with a cap.

Unlike a cap system with grandfathered permits, a carbon tax raise revenues. If the revenues are used to reduce other distortionary taxes, this can improve the efficiency of the tax. On the other hand, a cap with grandfathered permits can have an efficiency advantage of being applied to all industries. This provides an equal incentive at the margin for all polluters to reduce their emissions. This is an advantage over a tax that exempts or has reduced rates for certain sectors.

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