Working papers, technical notes, and operational frameworks from the Austral team — published for review by Ministry of Finance staff, sector regulators, MDB advisors, lenders, and academics. Each paper is released with a reproducible reference implementation and downloadable artefacts so that every recommendation it produces is fully traceable to its inputs.
Four live infrastructure-finance cases a week, drawn from public reporting — each with one technical lesson and one constructive governance fix — tied together by a single fiscal through-line. Latest: Issue 11 — Every PPP is a payment promise. Most never reach the debt number.
What a public-private partnership commits a government to — firm and contingent — and how ministries price, cap, count and disclose it. Monthly, on the third Thursday. Latest: Ninety Times, and Twice
Most fiscal-risk work teaches ministries to price a single PPP guarantee. But once a fiscal rule counts the contingent book against a hard ceiling — as Peru's 2025 PPP law now does, at 12% of GDP — the binding constraint is no longer the ceiling: it is the rule used to score the whole guarantee book against it. At expected value the book hides its correlated tail; at the sum of maxima it strangles the pipeline; only its portfolio expected shortfall counts diversification. On a worked nine-project pipeline the scoring rule alone is worth a whole project of extra infrastructure under the identical ceiling, and expected-value scoring understates the true tail by US$8.9bn. The paper builds the missing layer — a reproducible optimiser that rations a pipeline under the ceiling, runs it across every ceiling architecture, and recommends where a well-set cap should sit (~8–12% of GDP). Correlation anchored to Peru's macro history; all code published.
Public-private partnerships are held to sustainability, gender and environmental standards that are not applied to the public investment programme they are drawn from. This paper asks why, and finds that the asymmetry does not track performance — it tracks contractibility: the standard is applied where there is a counterparty to bind, not where the problem is largest. And it falls on a small channel: by the IMF’s capital-stock data, cross-checked against the World Bank’s PPI database, the PPP modality is about 3% of public capital spending in the countries that report it. Coded for normative force, the appraisal rulebooks of seven jurisdictions require gender in none of them — and the PPP curriculum names it ninety times without a procedure, parameter or threshold. Holding the publisher fixed, the World Bank and IMF public-investment guides name gender twice in 526 pages and require it nowhere. The asymmetry is authored, not a lag in national capacity. The fix is one standard across modalities, with only the moment of specification differing — and the UK Green Book is the working model.
Every government running a PPP programme faces one question above all: how much can we still commit? Answering it needs two projections side by side — what the sector’s budget will be, and what signed contracts have already spoken for. The difference is the affordability envelope, and almost nobody publishes it. Chile is the case that settles whether governments build it privately: it does. The instrument runs from 1995 to 2050 in inflation-indexed units and carries both halves in one place — and it is not public. The author requested it under the access-to-information law and it was refused, under the trade-secrecy exception, because the live file embeds estimates tied to contract modifications under negotiation. That reason is a good one, and the paper says so. Separating the legitimately reserved row from the rest is the contribution: the payment path of signed contracts is published supreme decrees, and the ministry’s budget is published law. Neither carries an exception. They were simply never reported, because the instrument was built as a management model and no disclosure product was ever designed on top of it. Written without using the author’s 2022 working copy: the argument runs on architecture and a synthetic country, where the same signed portfolio yields 2055 headroom of 111 or 297 — a factor of 2.7 — on the ceiling assumption alone. Direct-commitment counterpart to The Recognition Rule and The Useful Silence.
This paper set out to measure a maintenance cliff and could not: in Chile, the developing world’s longest continuous concession programme, no per-contract conservation-spending series exists — a null reported here rather than buried. What the record shows instead is more consequential. Under Article 25 of Chile’s concessions law, expired works “shall be granted in concession again,” with no gap between contracts; reversion to the State is the exception, requiring a reasoned presidential decree. The asset does not come back — as a matter of law, it is not meant to. Across 18 assets concessioned more than once — 41 contract generations, 3,687 documents — fourteen of seventeen transitions lengthen the term and every observed budget rises, with a median multiple of 3.25. None of this measures deterioration, and the paper is emphatic: the increase decomposes into capacity expansion, safety standards that did not exist at first tender, real construction-cost inflation of just 8.2% over 9.25 years on the Ministry’s own index, and environmental and consultation duties enacted after award. Two consequences follow. Fiscal accounting is wrong as a matter of law, not of practice — PFRAM, IPSAS 32 and ESA 2010 all treat the concession period as the life of the arrangement, while Chilean statute makes renewal the default. And the headroom an affordability envelope shows opening as contracts expire is legally pre-committed, not discretionary space.
Every quantitative paper in this series ends at the same puzzle: the liability is real, the valuation is tractable — and almost no government prices it. In half of the IMF’s fiscal-transparency evaluations to date, PPP disclosure is rated “Not Met,” the lowest rating the Code awards. The standard explanation is capacity. This paper argues the better one is incentive: the silence is useful. When a fiscal rule binds on a measured aggregate, any contract form whose obligations escape the measure lets a government buy visible infrastructure now and book the cost later, invisibly. The argument is not heterodox — it is the official sector’s own stated view, quoted at length from the IMF, the European Court of Auditors and Eurostat, and confirmed behaviourally wherever the recognition boundary moved: the UK’s abolition of PFI, Portugal’s forced consolidation, Italy’s off-budget agency, and a government-pay market segment that fell from over 80% of European deals to a trough of 30% as the statistical rules tightened — a fall that survives excluding the UK. We also ran the obvious cross-country panel across 72 economies and report it as what it is: a null, pre-registered as such before the data were assembled. The reforms that bite are the ones that remove the usefulness of the silence — recognition parity, disclosure of the full commitment stock, and fiscal anchors written on a perimeter no contract form escapes. Political-economy companion to The Recognition Rule.
The World Bank's Hybrid PPP Initiative makes a viability gap fund the workhorse of blended infrastructure finance — but decides that a subsidy is warranted without answering the only question a finance ministry faces: how big should it be? This paper argues the gap is an output, not an input — a large share of apparent funding gaps are risk-allocation problems misdiagnosed and subsidised — and that its size is computable, not a matter of judgment. On a worked $620M concession the optimiser returns a required VGF of 0%. The discipline: minimise before you fund, size the residual, recognise what remains. Constructive companion to Sizing the Viability Gap Fund.
The anchor is not wrong — it is pointed at the wrong number. Chile anchors its fiscal rule to a prudent debt level of 45% of GDP, measured on central-government debt alone (41.5% at end-2025); consolidate SOE debt, PPP commitments and the contingent-liability stock the State itself publishes, and the augmented liability is 57–61% of GDP. The paper reproduces the Ministry of Finance's own fiscal-space model from the public record and re-runs it across the perimeter — the breach probability rises from 8.5% to 13–16% — and shows the newly-advanced Reconstruction Law's corporate-tax cut is on its own enough to push even the narrow measure across 45% by 2028. Most striking of all: under Chile's transparency law, neither DIPRES nor the Ministry of Finance can produce the model that derived the 45% — the number is written into law, but no part of the State can show where it came from, a matter now before the Council for Transparency. Fully reproducible; all code and data published.
A planner's framework that makes the maxim "allocate each risk to the party best able to bear it — at a reasonable cost" quantitative: the efficient retention share for each risk, bounded by the bankability ceiling beyond which the private sector will not bear it at any price. The cost of equity is its price and Value for Money its integral; per-risk premia estimated from market prices, on the Austral platform.
The phrase "risk allocation" appears in none of the bidding terms of Chile's 133 concessions, and there is no risk matrix. The allocation is there all the same: reconstructed from the operative clauses, it yields a holder, a mechanism and a citation for 618 of 665 contract × risk cells (93%), written across a median of 53 separate clauses per contract — and 79% of those cells share the risk between the parties. Currency is the telling exception: only ten contracts ever pacted a currency clause, eight of them a currency-cover mechanism from a single 2000–2003 cohort, which the concessionaires who held it renounced once they could refinance in UF. A companion to The Optimal Risk-Retention Frontier, measuring the quantity that paper optimises.
A planner's framework for the statistical and accounting recognition of PPP liabilities — why they are "silent," where the rule books (ESA 2010, IPSAS 32, GFSM 2014) disagree, and the recognition gap between a contract's fiscal-rule treatment and the economic tail the sovereign actually bears. Implemented on the Austral platform; anchored in the UK PFI gap and Chile's contingent-liability disclosures.
A planner's framework for the correlated value-at-risk of a Ministry of Finance's whole guarantee book — the macro-prudential layer missing from FCCL — decomposed to the project and risk factor that own the tail. Implemented on the Austral platform; the headline is that correlation, not count, drives portfolio risk: a small concentrated programme can be far riskier than a larger, well-spread one.
A planner's framework for the three moves when a PPP renegotiation demand lands — accept, counter, or terminate — pricing each on one cost-to-government axis, with the option value of a credible termination threat. Implemented on the Austral platform and anchored in the Chilean concession panel, where 63% of concessions were renegotiated.
A planner's framework for the contingent liability hidden in every indexed tariff — pricing the affordability ceiling beyond which an inflation, exchange-rate, or demand clause becomes a public bill. The general statement of which the Silent FX Liability is the ceiling-zero special case; implemented on the Austral platform, anchored in Chile's electricity-tariff freeze.
A planner's framework for pricing and placing the currency mismatch in PPP and IPP contracts — retain, hedge, guarantee, or push back — implemented on the Austral platform, with post-mortems of six devaluation cascades.
A deployable structural-screening instrument for the Ministry of Finance's fiscal-approval gate, demonstrated — and stress-tested to a null — on Chilean and Brazilian concession panels, implemented on the Austral Platform.
A practitioner's end-to-end walkthrough of the Austral platform — running every assessment the World Bank PPP Reference Guide recommends across the full project lifecycle, with the platform's live numerical output.
A re-partition of analytical responsibility in PPP governance, with empirical evidence from 50 countries and 12 canonical doctrine documents, implemented on the Austral Platform.
A quantitative decision framework for MIGA, IBRD, IDA, regional MDB, bilateral DFI, and ECA guarantees on infrastructure projects, implemented on the Austral Platform.
A decision-support family for the smallest public subsidy a PPP needs — single-objective sizing, multi-objective Pareto fronts, robust optimisation under stress, and continuous risk-allocation search.
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