Carbon Pricing Concept

Burning a ton of coal produces electricity the plant owner sells, but it also deposits CO2 in the atmosphere, raising future flood risk, heat stress, and crop losses borne by everyone else. The market price reflects mining and shipping costs. It does not reflect the damages. That gap is the externality, and carbon pricing closes it.

Two main forms exist. A carbon tax sets a price per ton of CO2 (say, $50/ton), and emitters pay it. Cap-and-trade sets a total emissions limit, issues permits up to that limit, and lets companies buy and sell them. The permit price becomes the effective cost per ton.

Both create the same incentive: every ton of CO2 has a price, so every decision that avoids a ton has a financial payoff. A utility switching from coal to gas, a factory installing efficient equipment, a consumer buying an EV: each profits from the gap between the carbon price and their abatement cost.

A steel mill faces a $40/ton carbon price. It calculates it can eliminate one ton of CO2 for $25.

What does the mill do?

It cuts that ton of emissions and pockets the $15 difference. The firm does not need to care about climate to respond. The financial incentive is enough. Economists prefer pricing over command-and-control regulation because it finds the cheapest cuts across the whole economy rather than dictating which cuts to make.

The design problem: low-income households spend a higher share of income on energy, making a carbon tax regressive without offsetting rebates. Canada's carbon price returns all revenue as equal per-household dividends, making most lower-income households net winners.

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