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炭素の道徳的コスト

The Moral Cost of Carbon (原題)

Sébastien Houde, Corinne Faure, Joachim E. Schleich

CESifoジャーナル2026-11-08#炭素価格Origin: Global対象セクター: transport
DOI: 10.65864/mg8vukw6ca
原典: https://doi.org/10.65864/mg8vukw6ca
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🤖 gxceed AI 要約

日本語

個人が消費判断に暗黙的に適用する内部炭素価格を「炭素の道徳的コスト（MCC）」と定義し、実験でその分布を測定した。MCCはゼロに大きな塊がある一方で長い右裾を持ち、条件付き中央値は約500ユーロ/トン。カーボンオフセットへの支払意思額とは異なり、ピア情報で可変的、炭素フレームの課金があると動機のクラウディングアウトが生じる。炭素税と宿泊のフットプリント開示の選択という地域気候政策設計への応用を示す。

English

The authors define the moral cost of carbon (MCC) as the internal carbon price individuals implicitly apply to consumption, and measure its distribution via two experiments. MCC has large mass at zero but a long right tail (conditional median ~€500/t), differs from offset willingness-to-pay, is malleable to peer information, and can be crowded out by carbon-framed fees. They illustrate use for choosing between a carbon fee and mandatory footprint disclosure in local climate policy.

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

炭素税・カーボンプライシングの受容性や情報開示の行動効果を扱う点は、日本での炭素賦課金・GX経済移行債下の価格シグナル設計や、Scope 3開示が消費者の行動変容に与える影響を考える上で示唆的。

In the global GX context

Speaks to the behavioral foundations of carbon pricing and disclosure mandates central to TCFD/ISSB-era policy debates—especially whether footprint disclosure complements or substitutes for carbon fees, and how moral/peer motives interact with formal pricing.

👥 読者別の含意

🔬研究者:Provides a measurable construct (MCC) and experimental protocol linking moral preferences to carbon pricing and disclosure design.

🏢実務担当者:Suggests consumer footprint disclosure and carbon-framed fees can shift or crowd out intrinsic motivation—relevant to product labeling and pricing strategy.

🏛政策担当者:Offers evidence on when mandatory footprint disclosure should complement a carbon fee, and on crowding-out risks of carbon-framed charges.

📄 Abstract（原文）

We define the concept of the moral cost of carbon (MCC): the internal carbon price individuals implicitly apply to their consumption decisions. We propose an experimental procedure to measure the distribution of the MCC and implement it in two experiments. Five facts emerge. (i) The MCC has a large mass at zero, but it has a long right tail, with a conditional median of about 500 euros per ton. (ii) It is similar on average across consumption domains, but not within individuals. (iii) It differs from the willingness to pay for carbon offsets. (iv) It is malleable with respect to information about peers' valuations. (v) It can be subject to motivation crowding-out when a carbon-framed fee is present in the decision environment. We illustrate the use of the MCC for the design of local climate policies. We consider a planner who must choose between a carbon fee and mandatory disclosure of the footprint of tourist stays. Whether disclosure should complement a carbon fee ultimately depends on whether moral costs should be accounted for in welfare.

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