The market was not simply voting on an election

Financial markets can absorb political disagreement. What they struggle with is uncertainty over the assumptions supporting asset valuations.

The US midterm elections of November 2026 offered a striking example. Following an initial post-election rally, US equities reversed sharply on 5 November. The speed of the reversal was remarkable. But the more important question was what investors had suddenly begun to reconsider.

The answer extends beyond party politics. It concerns the relationship between government policy, capital expenditure, earnings expectations and the prices investors are willing to pay for future growth.

From political headlines to financial assumptions

An election result does not automatically change corporate earnings. What it can change is the probability investors assign to future policy outcomes.

For technology companies, these outcomes may include restrictions on data-centre development, energy infrastructure approvals, antitrust scrutiny, taxation and the regulatory treatment of artificial intelligence.

Financial markets value expected future cash flows, not simply current profits. A company whose valuation assumes several years of exceptional expansion is sensitive to even modest changes in those assumptions.

Consider a business priced on the expectation that AI infrastructure spending will continue growing aggressively. If investors begin to anticipate delays in approvals, higher compliance costs or slower customer investment, its long-term earnings outlook may weaken. Even before any legislation is enacted, its valuation can change.

This is the transmission mechanism through which political uncertainty becomes market risk.

The AI investment cycle faces a different test

For several years, the AI investment narrative has been supported by three connected expectations:

  1. Demand for computing power will continue expanding.
  2. Technology companies will sustain substantial capital expenditure.
  3. That investment will eventually generate sufficient earnings and productivity gains to justify today's valuations.

These assumptions are not independent. Data centres require electricity, land, financing, permits and complex supply chains. Semiconductor companies depend on continued infrastructure investment. Cloud providers need sufficient commercial demand to earn attractive returns on capital.

A policy change affecting one part of this ecosystem can influence expectations throughout the chain. But it would be premature to conclude that the long-term AI opportunity has disappeared.

A great company and a great investment are not always the same thing.

That distinction becomes especially important when valuations already reflect years of anticipated success.

Volatility is more than a measure of fear

The Cboe Volatility Index, or VIX, reflects the options market's pricing of expected near-term volatility. For portfolio managers, it provides information about the market's pricing of uncertainty, not a direct forecast of market direction.

When volatility rises abruptly, several mechanisms can reinforce an initial decline. Options hedging can intensify price movements. Volatility-sensitive strategies may reduce exposure. Leveraged positions may face tighter risk limits. Portfolio managers may sell liquid assets to meet cash requirements.

The result can be a market decline that exceeds what a straightforward reassessment of earnings would otherwise imply.

This is why identifying the initial catalyst is not enough. Investors must understand how positioning, liquidity and risk-management mechanisms can amplify a shock.

What happens to diversification?

A conventional multi-asset portfolio is built around the principle that different asset classes respond differently to economic conditions. That principle remains valuable, but correlations are not constant.

During a growth shock, government bonds may benefit as investors seek safety. During an inflation shock, both equities and bonds may struggle if markets expect interest rates to remain elevated.

Gold may attract defensive demand, yet it can face selling pressure when investors need immediate liquidity. Digital assets may experience even greater sensitivity to risk appetite and funding conditions.

The practical lesson is that diversification should be evaluated across different market regimes, not merely through historical average correlations.

A portfolio that appears diversified in normal conditions may behave very differently during a sudden political or liquidity shock.

Three scenarios for investors

Scenario one: Policy fears fade. Investors conclude that the political outcome will have limited effect on AI infrastructure development. Earnings expectations remain broadly intact, volatility declines and quality technology businesses recover.

Scenario two: Growth expectations moderate. New policy uncertainty and tighter financing conditions slow investment. The market differentiates more aggressively between profitable businesses and companies whose valuations depend on distant future earnings.

Scenario three: A broader risk-off cycle develops. Political uncertainty combines with weaker earnings, higher financing costs or liquidity pressure. Selling spreads beyond technology, and portfolio resilience becomes more important than short-term return maximisation.

These scenarios are not forecasts. They provide a framework for assessing portfolio exposure as information emerges.

The portfolio manager's perspective

The appropriate response to political volatility is not necessarily to sell equities or abandon growth investments. It is to examine the assumptions underlying each position.

How much of a company's valuation depends on future capital expenditure? How sensitive is the investment to financing conditions? How much concentration exists across securities exposed to the same underlying theme?

Investors should distinguish between temporary volatility and genuine deterioration in fundamentals.

Risk management is not about eliminating uncertainty. It is about ensuring uncertainty does not force decisions at the worst possible moment.

Political developments can expose financial assumptions that investors had stopped questioning. And when expectations are crowded, even a small change in the perceived future can produce a large change in today's prices.

Sources and references

Independent market commentary, not personalised investment advice.