A disputed decision goes in. A calibrated decision model comes out.
Assumptions are stated. Constraints are explicit. Competing positions run through the same model. The result shows what changes the decision, and what does not.
1
Model
The mechanism behind the decision.
2
Calibration
The numbers that make it real.
3
Decision range
What follows under each defensible assumption.
03 — Markets
Where the model earns its keep.
Banking & capital
Parent-bank exposure, capital requirements and resilience in a crisis.
Capital structure
Stress calibration
Group / parent constraints
Worked case: capital backing of UBS AG's foreign participations. Four proposals before parliament, one balance sheet, and the loss assumption none of them states. Working paper, code open.
Europe certifies carbon removal without the energy it costs. A tonne on the ledger and a tonne in the air are no longer the same object, and the rule made them different before anyone optimised against it.
Policy alternatives
Risk allocation
Regulatory trade-offs
Worked case: EU carbon certification. Measured, then discarded. Under review.
Over two billion dollars, private and public, went into direct air capture. The floor was published after. Which of your commitments still has one to check?
Capital allocation
Scenario decisions
Constraint analysis
Investment, offtake or cover, checked against the bound before the term sheet is signed
Four numbers. One balance sheet. One missing assumption.
50Implied loss 8 %
60Implied loss 28 %
90Implied loss 88 %
100Implied loss: none
Per cent of the exposure. Implied loss: the crisis loss at which each proposal would be the balancing share, at equal weights (working paper, Table 1).
Proposed CET1 backing ratios for UBS AG's foreign participations range from 50 % to 100 %. Floor1200 puts them into one model and asks the question the percentages alone cannot answer: what loss is the rule meant to withstand?
76–81%
Calibrated backing at the Credit Suisse loss of 60 % reported by the Swiss Federal Department of Finance, depending on the weighting of taxpayer protection against capital capacity; USD 31.8–34.0 bn, against 15.8 bn held today. Above 92 % the parent breaches its requirement before any crisis.
Margins against the backing share, UBS AG standalone, 30 June 2026. Thick line: the bank's headroom, 0.921 − b. Rising lines: the taxpayer's margin, b − ℓ, at a loss of 22 % (dashed), 60 % (solid) and 100 % (dotted). Dots: balancing share at equal weights. Red line: the ceiling set by the parent's capital. Grey verticals: the four proposals. Working paper, Figure 1 and Section 3.2.
06 — Evidence
Published so the result can be attacked.
Assumptions, calculations, sources and limits stay visible.
UBS: How much backing is enough?
Four proposals. One balance sheet. The missing variable is the loss assumption.