A key second-order risk of the government shutdown is the halt of incoming economic data. This data blackout impairs the Federal Reserve's ability to make informed monetary policy decisions, creating significant uncertainty for investors and the broader economy ahead of key meetings.

Unlike 10-15 years ago when events like the 'fiscal cliff' caused significant market fear, government shutdowns no longer move derivatives markets. Investors now view them as short-lived, pre-negotiated political theater with no real impact on market fundamentals, and even perceive them as bullish.

Historically, the aggregate macroeconomic effects of government shutdowns are modest and reversible. A useful rule of thumb is that each week of a full shutdown reduces annualized quarterly GDP by just 0.1%. A partial shutdown, which is more likely, would have an even smaller impact on growth.

Shutdowns pause the release of potentially bearish economic data and pressure the Fed to be more cautious, supporting liquidity. Markets now discount these events, seeing them as temporary political theater with a predictable resolution, unlike in the past when they caused fear and hedging.

Despite causing significant personal hardship, government shutdowns have a minimal and short-lived impact on overall GDP. Lost federal worker pay is quickly restored upon reopening, and most economic activity catches up, making the net effect a near wash over subsequent quarters.

Unlike past shutdowns defined by temporary furloughs, the current administration has suggested permanent staff cuts. This unprecedented threat introduces significant legal and economic uncertainty that markets have not previously had to price in, raising the stakes for investors and the long-term economic outlook.

The most significant danger of a prolonged government shutdown is the disruption to federal statistics. This creates an "unsettling" lack of visibility for policymakers, potentially causing them to miss a critical economic downturn and delay a necessary response. The direct GDP impact is often recoverable later.

Investors should not over-react to congressional turbulence. Many of the most market-relevant policies—on trade, regulation, industrial strategy, and AI—are executed via executive authority, not congressional action. This means their trajectory is unlikely to be altered by events like a shutdown or shifting political dynamics in Congress.

The direct GDP impact from furloughed federal workers is small, mechanical, and quickly reversed. The more significant and lasting economic damage from a prolonged shutdown stems from its effect on the private sector, such as backlogged IPOs at the SEC or delayed construction projects waiting on permits.