Revenue Recycling in a US-Calibrated Two-Sector Climate Economy Model with Carbon Taxation

The Carbon Tax Dilemma: Efficiency, Politics, and the Payoff

For decades, the consensus among global economists has been nearly unanimous: carbon pricing is the most efficient lever to reduce greenhouse gas emissions. By internalizing the social cost of carbon—making polluters pay for the damage they cause—a tax theoretically steers the entire economy toward cleaner alternatives without micromanagement by the state.

However, the political reality in the United States has been far more complex. While the passage of the Inflation Reduction Act (IRA) in 2022 marked a historic shift in US climate policy, it relied almost exclusively on "carrots" (subsidies and tax credits) rather than "sticks" (carbon taxes).

Despite the success of the IRA in spurring green investment, many experts argue that subsidies alone may not be enough to reach Net Zero targets efficiently. As the national debt rises and the "low-hanging fruit" of decarbonization is picked, the debate is circling back to carbon taxation—not just as a climate tool, but as a revenue generator.

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This brings us to the critical question: If the US implements a carbon price, how should the revenue be utilized? New modeling suggests that for the US economy, cash dividends might beat tax cuts.

The US Context: A "Narrow Base" for Carbon Pricing

To understand the economic impact of a carbon tax, it is essential to first understand the structure of the US economy. Calibration to 2022 data reveals a striking asymmetry: the "Brown Sector" (fossil fuels, heavy industry, utilities) accounts for just 3.7% of US GDP and employs only 1.8% of the workforce, yet it generates 55.7% of national greenhouse gas emissions.

This concentration presents a unique policy opportunity. A $100/ton carbon tax targets a tiny sliver of economic activity to achieve massive reductions. In the simulation, this tax drives a 41% reduction in emissions by Year 10.

However, this "narrow base" also limits the revenue available. As emissions fall from ~2.67 Gt to ~1.17 Gt over the decade, revenue settles near $117 billion annually in the long run. While substantial, this represents roughly 0.5% of GDP—a relatively small pot of money to use for offsetting distortions in the wider economy. This constraint defines the "Revenue Recycling" debate.

Four Approaches to Revenue

The analysis tests four distinct strategies for utilizing this carbon revenue:

• No Recycling Baseline: Revenue creates a budget surplus.
• Lump-Sum Equal cash dividends to all households.
• Labor Tax Reducing payroll or income taxes.
• Capital Tax Reducing corporate or capital gains taxes.

The Results: Consumption Drives the Outcome

Standard economic theory (often referred to as "The Double Dividend") suggests that using revenue to cut distorting taxes on capital or labor should boost GDP more than handing out cash. However, the US-calibrated model produced a different result.

Figure 1: Economic impacts of different revenue recycling schemes over 40 quarters.

As the chart above illustrates, the choice of recycling mechanism has distinct impacts on the economy over the 10-year horizon (40 quarters):

• GDP Impact (Top Left): The Green Line (Lump-Sum) clearly outperforms the others. By Quarter 40, lump-sum transfers result in a GDP loss of 1.67%, compared to 1.77% for tax cuts and the baseline. While the margin is modest, the hierarchy is clear: cash transfers preserved more economic activity.
• Consumption Impact (Top Right): This panel reveals why lump-sum transfers won. The Green Line shows a significantly smaller drop in consumption compared to the Orange (Capital Tax) and Blue (Labor Tax) lines. By returning revenue directly to households, the policy sustains aggregate demand.
• Investment Response (Bottom Right): Surprisingly, Capital Tax Cuts (Orange Line) failed to spur investment significantly more than the baseline. In a model with realistic US frictions, the incentive effect of a small tax cut was overpowered by the income effect of the carbon tax.

Why Did "Theory" Fail?

Why didn't tax cuts generate the expected "efficiency dividend"?

1. The Demand Channel

In the medium term (10 years), the US economy is consumption-driven. The "Keynesian" boost from cash transfers proved more potent than supply-side incentives.

2. Low Baseline Taxes

The US has relatively low labor/capital taxes compared to Europe. The marginal efficiency gain from cutting them is therefore smaller.

3. Inelasticity

US labor supply is relatively inelastic. Cutting payroll taxes didn't induce enough new work hours to offset the tax drag.

The Debate: Theory vs. Reality

Are these findings credible? They diverge from older economic models which assumed markets would perfectly adjust to tax cuts. However, these findings align with the growing "real-world" consensus that emphasizes the importance of aggregate demand and political sustainability.

This shift is reflected in the historic Economists’ Statement on Carbon Dividends (2019), signed by over 3,500 US economists—including Janet Yellen, Ben Bernanke, and 27 Nobel Laureates. They argued that "to maximize the fairness and political viability of a rising carbon tax, all the revenue should be returned directly to U.S. citizens."

While supply-side theorists might argue that tax cuts yield higher growth over 30–50 year horizons, the 10-year horizon—which is most relevant for current policy cycles—heavily favors the demand support provided by cash dividends.

Distribution and Equity

Beyond aggregate GDP, the case for Lump-Sum Transfers is strengthened by equity. Carbon taxes are regressive; they hit low-income energy budgets hardest.

Lump-Sum Dividends

Turns the policy progressive. The bottom 70% of households typically receive more in dividends than they pay in higher energy costs.

Tax Cuts

Often favor higher earners or shareholders, potentially exacerbating the regressive impact of energy price hikes.

The Bottom Line

Revenue recycling is not a magic wand that eliminates the cost of climate policy, but it is a crucial tool for management.

• The Trade-off: A $100/ton tax achieves a massive 41% reduction in emissions for a manageable GDP cost of 1.67%–1.77% over a decade.
• The Verdict: In the specific context of the US economy—with its consumer-driven growth and concentrated emission sources—Lump-Sum Dividends appear to be the superior policy choice. They offer the best protection for GDP (by supporting consumption), the best outcome for equity (by protecting low-income households), and the highest political feasibility.