The Social Cost Scope — The Neglected ‘S’ in ESG

01 The Boundary Logic

Three scopes of attribution, exactly parallel to the Greenhouse Gas Protocol.

The Social Cost Scope assigns the human cost of an enterprise’s activity to where it actually falls. A practitioner fluent in carbon accounting will recognise every load-bearing element, because every load-bearing element is deliberately the same.

SCS‑1

Direct

Own workforce & host communities

The wages, safety and conditions of the people the enterprise employs directly, and the communities in which it operates.

SCS‑2

Contracted

Suppliers & purchased inputs

The labour conditions of tier-one suppliers and the community footprint of purchased energy and materials.

SCS‑3

Lifecycle

Extraction → use → disposal

The full chain of human cost no current rating books: child labour in artisanal mining, the regressive incidence of who can afford the clean machine, the burden of its disposal.

Figure 1Where, across a value chain, the human cost of an enterprise’s activity actually falls — the deliberate analogue of the Greenhouse Gas Protocol’s scopes, from mine face to waste pile.

The Social Cost Scope across a value chain: SCS-1 direct, SCS-2 contracted, SCS-3 lifecycle, from mine face to waste pile

02 What Makes It New

Two additions the carbon ledger never needed — and the human question cannot do without.

The scopes are adapted from existing accounting. The originality of the Social Cost Scope, and its claim to measure what carbon accounting cannot, rests on two factors that have no analogue in the Greenhouse Gas Protocol. Each is applied as a lens across all three scopes.

The I‑factor

Incidence Gradient

Records how each cost distributes across income groups — the blunt arithmetic of who actually pays. A carbon price booked as an average hides this gradient entirely. It is what turns poverty and inequality from slogans into ledger entries.

The T‑factor

Temporal Displacement

Records when the cost lands. The cruelty of a transition is so often that the job is destroyed this year and the green job arrives, to someone else, years later. Netting the two as contemporaneous erases the gap.

Figure 2The two additions beyond the carbon model. Both are original to this standard.

The two additions beyond the carbon model: the Incidence Gradient showing who bears the cost, and the Temporal Displacement factor showing when it lands

03 Where It Sits

Not a rival to the ESG stack — the measurement layer beneath it.

ESG has no single authority. It is a decentralised, interoperable stack: PRI for investing doctrine, ISSB for investor disclosure, GRI for impact, the rating agencies, the regulators. Every one of them shares the same gap — no standardised, attributed measure of Social cost across the value chain. The Social Cost Scope supplies exactly that, in the form each instrument already uses. It completes the architecture rather than competing within it.

Figure 3The Social Cost Scope as the common measurement layer beneath PRI, ISSB, GRI, the rating agencies and the regulators.

$Where the Social Cost Scope sits in the ESG architecture, as the measurement layer beneath PRI, ISSB, GRI, rating agencies and regulators$

04 What It Makes Measurable

Each scope renders specific Sustainable Development Goals into attributed cost.

The test of a Social-measurement standard is whether it renders the things society says it cares about into numbers that can be acted on. The most widely agreed statement of that is the 2030 Agenda and its seventeen Sustainable Development Goals — several squarely Social, and precisely the ones current ESG measurement leaves as aspiration rather than accounting.

Figure 4The Social Cost Scope mapped to the Sustainable Development Goals, scope by scope.

The Social Cost Scope mapped to the UN Sustainable Development Goals, by scope

The content of this figure has not been approved by the United Nations and does not reflect the views of the United Nations or its officials or Member States.

Why a New Standard Is Needed

Markets discipline what they can verify. The Social pillar is the least verifiable of the three — so it attracts the weakest discipline, and capital rewards the company that can document its emissions over the one that can only assert its decency.

The rating agency is not indifferent to human cost; it is unable to see it. Between October 2025 and June 2026 the contradiction sharpened across five jurisdictions at once — the EU exempting a third of its workforce from the very Social standards it had just written; an €86.7bn fund conceding that its carbon price is regressive; the United States dismantling federal disclosure as one in six households fell behind on energy bills. The neglect is not a gap in the data. It is a gap in the architecture. Fix the seeing, and the discipline follows. That is the entire wager of this work — and the Social Cost Scope is the instrument that fixes it.

About the Author

Paul Gardner Brook

Paul Gardner Brook is a former Bulge Bracket senior investment banker who writes on the intersection of geopolitics, finance, policy, strategy and energy. “The Neglected ‘S’ in ESG: From the Carbon Ledger to the Human Ledger” is the second instalment in his continuing inquiry into the Social foundations of sustainable finance, following “The Neglected ‘S’ in ESG” (October 2025).

The new Social Cost Scope 1, 2 and 3