AI exuberance: Economic upside, stock market downside

The key findings of Vanguard’s economic and market outlook to be released in December

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Financial markets are exuberant—and there are some good reasons for that. Despite megatrend headwinds in 2025 like demographic slowdowns and rising tariffs, economies held firm. U.S. corporate earnings growth and fundamentals stayed strong, powered by AI investment and other positive technology shocks. 

Our data-driven megatrends framework shows these supply-side forces will shift again in 2026. How well AI investment will counteract negative shocks shapes our economic outlook. Over the next five years, we see an 80% chance that economic growth diverges from consensus expectations. These projections shape our investment outlook and offer somewhat unconventional —yet increasingly compelling—investment opportunities for increasingly frothy financial markets.

Vanguard’s 2026 economic forecasts

Notes: Forecasts are as of November 20, 2025. For the U.S., growth is defined as the year-over-year change in fourth-quarter GDP. For the euro area and China, growth is defined as the annual change in GDP in the forecast year compared with the previous year. Inflation is core inflation and thus excludes volatile food and energy prices. For the U.S. and the euro area, core inflation is defined as the year-over-year change in the fourth quarter compared with the previous year. For China, core inflation is defined as the average annual change compared with the previous year. For the U.S., core inflation is based on the core Personal Consumption Expenditures Index. For the euro area and China, core inflation is based on the core Consumer Price Index. For U.S. monetary policy, Vanguard’s forecast refers to the top end of the Federal Open Market Committee’s target range. The euro area’s policy rate is the deposit facility. China’s policy rate is the seven-day reverse repo rate.

^{Source: Vanguard.}

Higher growth is on the horizon, particularly for the U.S.

We anticipate that AI will stand out among other megatrends, given its capacity to transform the labour market and drive productivity. AI investment’s outsized contribution to economic growth represents the key risk factor in 2026. 

The ongoing wave of AI-driven physical investment is expected to be a powerful force, reminiscent of past periods of major capital expansion such as the development of railroads in the mid-19th century and the late-1990s information and telecommunications surge. Our analysis suggests that this investment cycle is still underway, supporting our projection of up to a 60% chance that the U.S. economy will achieve 3% real GDP growth in the coming years—a rate materially above most professional and central bank forecasts. 

But this future is not quite now. In 2026, the U.S. is positioned for a more modest acceleration in growth to about 2.25%, supported by AI investment and fiscal thrust from the One Big Beautiful Bill Act. The first half of the year may be softer given the lingering effects of the stagflationary megatrend shocks of tariffs and demographics, as well as yet-to-materialise broad-based gains in worker productivity. The labour markets, which cooled markedly in 2025, should stabilise by the end of 2026, helping the unemployment rate to stay below 4.5%. 

Economic growth is expected to keep U.S. inflation somewhat persistent, remaining above 2% by the close of 2026. This combination of solid growth and still-sticky inflation suggests that the Federal Reserve will have limited scope to cut rates below our estimated neutral rate of 3.5%. Our Fed forecast is a bit more hawkish than the bond market’s expectations.

Given similar AI-related dynamics, our forecast for China’s economic growth is also above consensus expectations in 2026. Despite ongoing external and structural challenges, real GDP growth is more likely to register 5% than 4%. 

Conversely, our risk assessment for the euro area is more consensus-like given the lack of strong AI dynamics. We anticipate growth to hover near 1% in 2026, as the drag from higher U.S. tariffs is offset by increased defense and infrastructure spending. Inflation should stay close to the 2% target, allowing the European Central Bank to maintain its current policy stance throughout the year. 

A differentiated investment playbook

Our capital markets outlook differs across markets, asset classes, and investment time horizons. Overall, our medium-run outlook for multi-asset portfolios remains constructive, with positive after-inflation returns likely to continue. In 2026, U.S. technology stocks could well maintain their momentum given the rate of investment and anticipated earnings growth. 

But let us be clear: Risks are growing amid this exuberance, even if it appears “rational” by some metrics. More compelling investment opportunities are emerging elsewhere, even for those investors most bullish on AI’s prospects. Our conviction in this view is growing, and it parallels investment returns in previous technology cycles.

Our capital markets projections show that the strongest risk-return profiles across public investments over the coming five to 10 years are, in order: 

1. High-quality U.S. fixed income. 
2. U.S. value-oriented equities.
3. Non-U.S. developed markets equities. 

We maintain our secular view that high-quality bonds offer compelling real returns given higher neutral rates. Returns should average near current portfolio income levels, representing a comfortable margin over the rate of expected future inflation. That’s the primary reason why bonds are back, regardless of what central banks do in 2026. Importantly, U.S. fixed income should also provide diversification in a world where AI disappoints, leading to lower growth—a scenario with odds that we calculate to be 25%–30%. 

We remain most guarded in our assessment of U.S. growth stocks, which admittedly have outperformed most other investments by an astounding margin. Yet, as we will show in this outlook, our muted expected returns for the technology sector are entirely consistent with our more bullish prospects for an AI-led U.S. economic boom.

The heady expectations for U.S. technology stocks are unlikely to be met for at least two reasons. The first is the already-high earnings expectations, and the second is the typical underestimation of creative destruction from new entrants into the sector, which erodes aggregate profitability. Volatility in this sector—and hence the U.S. stock market overall— is very likely to increase. Indeed, our muted U.S. stock forecast of 4%–5% average returns over the next five to 10 years is nearly singlehandedly driven by our risk-return assessment of large-cap technology companies.

The history of investing during technology cycles reveals some counterintuitive—yet increasingly compelling—investment opportunities regardless of whether AI proves transformative or not. Both U.S. value-oriented and non-U.S. developed markets equities should benefit most over time as AI’s eventual boost to growth broadens to consumers of AI technology. Economic transformations are often accompanied by such equity market shifts over the full technology cycle.

Overall, these three investment opportunities are both offensive and defensive. This risk assessment holds, no matter whether today’s AI exuberance ultimately proves rational or not. 

^Notes:

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Joe Davis, Global Chief Economist
26 November
vanguard.com.au