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Paper Summaries/Decision Accounting and Bank Model-Risk Regimes: A Clause-Level Crosswalk to SR 11-7 and BCBS 239
Paper #1014
Decision Accounting and Bank Model-Risk Regimes: A Clause-Level Crosswalk to SR 11-7 and BCBS 239
The paper examines whether Decision Accounting (DA) records satisfy the documentation requirements of two major banking supervisory regimes: SR 11-7 (model risk management) and BCBS 239 (risk data aggregation). Through a clause-level crosswalk, it finds that DA records are complementary, supplying a decision-reasoning layer that both regimes assume but do not require. The paper formalizes this complementarity and discusses implications for supervisory practice, including the recursive governance of DA scoring models under SR 11-7.
Reading welfare beta
Welfare beta, written as βW and pronounced beta W, means annual system-welfare loss divided by annual industry revenue, written as Π and pronounced capital pi. Revenue is the denominator, never profit; ΔW and Π must use the same domain, same time period, and same activity boundary. See the welfare-beta methodology manual.
OPEN HTML DECK ↗Deck mode is an on-site reading view, not a PowerPoint download.
Theorem status: evidence-traced claim under the cited paper's assumptionsFalsification: show the same game preserving system welfare without changing the payoff structure
KEY FINDINGS
THEOREM
Proposition 1 (Complementarity): Let R_SR be the set of requirements imposed by SR 11-7. Let R_BCBS be the set of requirements imposed by BCBS 239. Let R_DA be the set of requirements imposed by Decision Accounting. Then (i) R_DA ∩ R_SR = ∅, (ii) R_DA ∩ R_BCBS = ∅, (iii) There exists a set of supervisory review activities A such that A(R_SR ∪ R_BCBS ∪ R_DA) produces more informative assessments than A(R_SR ∪ R_BCBS) alone.
PLAIN ENGLISH
Decision Accounting records do not duplicate any requirement of SR 11-7 or BCBS 239, but using them together with these regimes gives supervisors a more complete picture than using the regimes alone.
EVIDENCE & LIMITATIONS
- Theorem status: evidence-traced claim under the cited paper's assumptions
- Falsification: show the same game preserving system welfare without changing the payoff structure
REFERENCES / CITATION STATUS
References section
Detected
Bibliography entries
29
In-text citations
1
Unique citations
29
Footnote markers
0
Citation year span
2008-2023
Source hash
4a237e7592f9
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EXECUTIVE SUMMARY
The 2023 failures of Silicon Valley Bank and First Republic revealed gaps in how banks document the reasoning behind model choices and risk-data aggregation decisions. Existing supervisory regimes—SR 11-7 and BCBS 239—focus on quantitative model validation and data infrastructure, but neither requires a structured record of the decision process. Decision Accounting (DA) proposes a seventeen-field decision record that captures reasoning, including system welfare consequences. The paper gives a clause-level crosswalk of DA to SR 11-7 and BCBS 239, assessing which requirements DA satisfies, partially supports, or is orthogonal to. The central finding is that DA is complementary: it covers the decision-reasoning layer that these regimes assume but do not require. The paper formalizes this complementarity with a proposition and proof sketch, and addresses the recursive governance of DA scoring models under SR 11-7. The analysis is anchored in the SVB and First Republic cases. The paper concludes that DA records improve the informativeness of supervisory assessments without substituting for existing requirements.
METHODOLOGY
The paper uses a clause-level crosswalk methodology, comparing each requirement of SR 11-7 and BCBS 239 against the seventeen fields of a DA record. For each requirement, it assesses whether DA satisfies, partially supports, or is orthogonal. The complementarity thesis is formalized with a proposition and proof sketch. The analysis is anchored in the SVB and First Republic cases.
SOURCE QUESTIONS
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WHY THIS MATTERS
For the economist
A structural claim about when bilateral optimization degrades the shared system. Read the formal statement and its stated axioms.
For the regulator
The constraint is physical or biological, so disclosure alone will not internalize it. The policy lever is to bound exposure, not to price it away.
For the executive
This is where a privately efficient decision can degrade the system the business depends on. The governance question is which decision records would make that system cost visible before it is normalized.
For the teacher
An on-site HTML deck and the expanded curriculum cover the argument, the evidence, and the measurement. Use the deck as a self-contained class session, then route deeper through the 45-50h core course or 100+h full curriculum.
For the affected community
In plain terms: who gains from the current arrangement, who pays for it, and what rule change would alter that split. The summary states each without jargon.
© 2026 Erik Postnieks · Independent Researcher · Salt Lake City