Carbon Tax vs Cap-and-Trade
Prerequisites
A carbon tax fixes the price and lets emissions float. Cap and trade fixes emissions and lets the price float. Both put a cost on carbon. The difference is which variable the government controls.
A carbon tax sets a fixed price per ton of CO2. Emitters pay that price on every ton, and total emissions are whatever the market produces at that price. Simple to administer, predictable for business planning, but the government cannot guarantee a specific emissions outcome. Cap and trade sets a total emissions cap, issues permits equal to that cap, and lets firms trade permits. The market discovers the price. The government guarantees the emissions outcome but cannot predict the price, which can spike during economic booms or crash during recessions.
Price certainty versus quantity certainty. The EU Emissions Trading System (EU ETS) price collapsed from 30 euros/ton in 2008 to under 5 euros in 2013 during the recession (excess permits flooded the market). British Columbia's carbon tax has held steady at its legislated level since implementation.
If a CEO needs to decide whether to invest $500M in carbon capture, which system provides better investment certainty?
The carbon tax. Under cap and trade, the permit price might be $50/ton today and $15/ton when the capture plant opens, destroying the business case. A tax at $50/ton provides the price floor the investment needs. This is why some economists favor hybrid designs: a cap-and-trade system with a price floor and ceiling, combining quantity certainty with price predictability.
The fundamental difference between a carbon tax and cap-and-trade is:
This is the core distinction. Tax = price certainty, quantity uncertainty. Cap-and-trade = quantity certainty, price uncertainty.
The answer is ALesson complete
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