Low-carbon vehicle taxes were linked to distributional injustice

What the study found: The study found evidence that a differentiated vehicle tax policy was associated with distributional injustice in the transition to low-carbon vehicles. Manufacturers captured substantial benefits by increasing markups on low-carbon vehicles, consumer surplus declined, and emissions fell only marginally.

Why the authors say this matters: The authors suggest that market power in car markets can limit the intended fairness and environmental benefits of low-carbon vehicle policies. They conclude that a different policy design could help support a just transition.

What the researchers tested: The researchers examined associations between low-carbon car policies and distributional injustice by comparing equilibrium outcomes under a differentiated tax policy with a no-policy counterfactual. They analyzed market outcomes in car markets where manufacturers have market power.

What worked and what didn't: The policy did not deliver the planned improvement in affordability for low-carbon vehicles. It appears to have allowed manufacturers to appropriate consumer surplus, while emissions decreased only slightly.

What to keep in mind: The abstract describes a comparison of policy versus no-policy outcomes, but it does not provide additional methodological detail or limitations. The summary available here does not state how large the effects were beyond the qualitative descriptions provided.

Key points

• The study found evidence of distributional injustice under a differentiated vehicle tax policy.
• Manufacturers increased markups on low-carbon vehicles and captured substantial benefits.
• Consumer surplus declined, and affordability did not improve as planned.
• Emissions decreased only marginally under the policy.
• The authors suggest a uniform vehicle tax plus sales requirements for low-carbon vehicles may help support a just transition.