Central Banks & Macro · catalyst playbook

US Government Shutdown Risk

A funding deadline forces a binary: a deal, a short shutdown, or a prolonged one. The market impact runs through the haven bid (gold, the dollar), volatility, and — critically — delayed official data that can leave the Fed flying blind.

What to watch: The funding deadline, whether a continuing resolution passes, and which economic releases (BLS/BEA) get delayed.

Three ways this can break, each with its butterfly cascade (the first move → what it sets off next) and a probable-recommendation playbook. Probabilities are our model's base rates for each outcome; cascade magnitudes are typical first-day reaction-function priors.

50%

Averted — last-minute deal

risk on

Congress passes a continuing resolution before the deadline. The haven bid that built up unwinds — relief risk-on, gold gives back, vol drops.

Immediate effects · the first move

▼ Volatility (VIX) VIX-5 to -10%the binary clears; the risk premium deflates
▼ Gold XAU-0.5 to -1.2%haven flows reverse on the deal
▲ US dollar (DXY) DXY+0.2 to +0.5%fiscal-credibility relief firms the dollar

Ripple effects · what it sets off next

▲ S&P 500 SPX+0.5 to +1%relief rally as tail risk is removed

Probable recommendation

Relief risk-on; unwind the hedges.

LongLong SPX↗ +0.7%

ShortShort VIX↘ -8%Short XAU↘ -0.8%

For a common-man portfolio: A last-minute funding deal removes a scare — stocks relax and gold gives back its safety premium. The most common outcome.

35%

Short shutdown — brief lapse

mixed

Funding lapses briefly. History says the direct market hit is limited and temporary, but gold catches a haven bid, vol rises, and delayed official data muddies the Fed's read.

Immediate effects · the first move

▲ Gold XAU+0.8 to +1.5%safe-haven demand on the political impasse
▲ Volatility (VIX) VIX+5 to +10%uncertainty premium rebuilds
▼ US dollar (DXY) DXY-0.2 to -0.5%soft on the governance overhang

Ripple effects · what it sets off next

▼ S&P 500 SPX-0.3 to -0.8%modest, historically recovers once it ends
▼ Official data (BLS/BEA)delayedNFP/CPI can slip — the Fed loses its dashboard

Probable recommendation

Modest risk-off; haven bid, limited & temporary.

LongLong XAU↗ +1.2%Long VIX↗ +8%

ShortShort SPX↘ -0.6%

Cash / hedgeKeep a small hedge but don't over-react — brief shutdowns have historically been bought.

For a common-man portfolio: A short shutdown is more noise than damage — gold ticks up, stocks wobble a little, and it usually reverses when it ends. Don't panic-sell.

15%

Prolonged shutdown — protracted impasse

risk off

The impasse drags on. The growth drag compounds, fiscal-credibility questions weigh on the dollar, gold runs, and an approaching debt-ceiling x-date can stress front-end bills.

Immediate effects · the first move

▲ Gold XAU+2 to +4%sustained haven demand + fiscal-credibility doubt
▲ Volatility (VIX) VIX+15 to +30%a prolonged impasse is a genuine risk-off event
▼ US dollar (DXY) DXY-0.5 to -1.5%governance/credibility erodes the dollar

Ripple effects · what it sets off next

▼ S&P 500 SPX-1.5 to -3%the growth drag and uncertainty compound
▼ T-bills near the x-dateyields spikeif a debt-ceiling x-date nears, bill yields gap

Probable recommendation

Defensive; haven over risk.

LongLong XAU↗ +3.0%Long VIX↗ +20%

ShortShort SPX↘ -2.5%Short DXY↘ -1.0%

Cash / hedgeRaise cash and hold gold/vol hedges; avoid bills maturing around any debt-ceiling x-date.

For a common-man portfolio: A long shutdown starts to bite the economy and Washington's credibility — gold and safety win, stocks fall. Hold cash and a gold hedge until it's resolved.

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Reaction-function priors tuned to the current regime, grounded in published cross-asset consensus — not measured abnormal returns (those are on the individual scenario pages). This is a probabilistic model of the future, not investment advice.