国境炭素調整に対する厚生最適な政策対応：新興経済国の視点
Welfare-optimal policy response to border carbon adjustments: An emerging economy perspective (原題)
Simon J. Bolz, J. Gallé
🤖 gxceed AI 要約
日本語
非対称国間のメリッツ型モデルを用い、貿易相手国の国境炭素調整（BCA）が被規制国の国内炭素価格引き上げに伴う厚生コストをどう変えるかを分析。BCAは相手国の輸出カットオフ反転を通じて輸入消費を拡大し厚生コストを緩和する。環境損害を組み込むとBCAは被規制国の厚生最適炭素価格を高め、両国間に政策整合のプラトーを生む。インド企業データで較正し、EU CBAMがインドの炭素価格収斂に伴う相対的厚生コストを低減し得ることを示す。
English
A Melitz-style asymmetric-country model analyzes how a trading partner's border carbon adjustment (BCA) affects the welfare cost of raising domestic carbon prices in the exposed country. BCA lowers these costs by reversing the partner's export cut-off and expanding imported consumption; the effect depends on energy intensity, productivity dispersion, and average productivity, and interacts with tariffs. With environmental damages, BCA raises the exposed country's welfare-optimal carbon price, creating a policy alignment plateau. Calibrated to India with firm-level data, the EU CBAM is shown to reduce India's relative welfare costs of carbon price convergence.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
EU CBAMの本格適用を控え、日本企業・政策当局にとっても輸出競争力と炭素価格整合の論点は直結する。新興国側の厚生コスト低減効果は、日本がCBAM対応を進める際の国際協調設計や国内炭素価格制度（GX経済移行債・炭素賦課金）の議論に示唆を与える。
In the global GX context
As the EU CBAM moves toward full implementation, this paper offers a theoretical basis for how BCAs can align carbon prices across trading partners rather than simply penalize exporters. It speaks directly to ISSB/CSRD disclosure of carbon costs and to transition-finance debates on competitiveness and carbon leakage, adding an emerging-economy welfare perspective often missing from EU-centric CBAM scholarship.
👥 読者別の含意
🔬研究者:Provides a tractable Melitz framework linking BCA design to welfare-optimal carbon pricing and structural asymmetries, useful for trade-climate modeling.
🏢実務担当者:Helps exporters anticipate how CBAM may interact with domestic carbon pricing and tariff policy, informing carbon cost pass-through and disclosure strategy.
🏛政策担当者:Suggests BCAs can create a policy alignment plateau, supporting carbon price convergence and international coordination design.
📄 Abstract（原文）
We develop a Melitz-style model of asymmetric countries to analyse how a trading partner's border carbon adjustment affects the welfare costs of raising a domestic carbon price in the exposed country. By examining how a unilateral increase in emissions taxes affects endogenous productivity cut-offs, we show that a border carbon adjustment reduces these costs through a reversal of the partner's export cut-off, thereby expanding imported consumption. This welfare-smoothing effect depends on structural asymmetries such as energy intensity, productivity dispersion, and average productivity, and interacts with conventional tariff policy. Extending the model with environmental damages, we show that a border carbon adjustment raises the exposed country's welfare-optimal carbon price, generating a policy alignment plateau between trading partners. Calibrating the model to India using firm-level data, we quantify these mechanisms in a three-region extension and show that the EU Carbon Border Adjustment Mechanism can effectively reduce India's relative welfare costs of carbon price convergence.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.35188/unu-wider/2026/798-5first seen 2026-10-31 05:31:10 · last seen 2026-11-06 05:20:52
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