The Dual Nature of the AI Boom: Vanguard's 2026 Outlook Reveals a Divergence Between the Economy and the Market

The Dual Nature of the AI Boom: Strong Economy vs. Falling Stocks

Vanguard recently released its *2026 Economic and Market Outlook*, titled "AI exuberance: Economic upside, stock market downside." This title precisely captures the delicate situation facing global markets today: artificial intelligence investment is injecting structural momentum into the economy, yet excessive market optimism may point to lower long-term stock returns. Based on this report, this article re-examines the logic behind the evolution of the global macroeconomy and explores asset allocation directions for the next five to ten years.

U.S. Economy: Mild in the Short Term, Strong in the Medium Term

According to Vanguard's forecasts, U.S. GDP growth in 2026 is expected to be 2.25%, the unemployment rate will stabilize around 4.2%, and core inflation will be near 2.6%. Behind these figures lies an intriguing macroeconomic mix: economic growth is neither hot nor cold, but inflation remains above the Fed's 2% target, while the labor market—after a noticeable cooling in 2025—is moving toward rebalancing.

The key lies in the role of AI investment. Vanguard's global chief economist, Joe Davis, points out that there is a 60% chance the U.S. economy will achieve 3% real growth over the next few years. However, this "bright future" will not fully arrive in 2026. The lagged effects of tariffs, stalled labor supply, and the fact that productivity gains have not yet become widespread will likely make first-half economic growth relatively weak. But the continued expansion of AI investment, combined with the fiscal stimulus from the *One Big Beautiful Bill Act*, will ultimately keep full-year growth on track.

On monetary policy, with solid economic growth and sticky inflation, the Fed has limited room to cut rates. Vanguard estimates the neutral level of the federal funds rate at 3.5%, meaning that is roughly the floor for policy rates this year. This judgment is slightly more hawkish than what the current bond market is pricing in.

Global Divergence: Different Stories for China and the Eurozone

The AI-driven growth logic applies not only to the United States. Vanguard forecasts China's economic growth to be around 5% in 2026, above the market consensus. Despite external and structural challenges, AI-related investment and productivity gains are producing similar positive effects. Notably, China's policy support may be stronger than expected, making the 4% growth scenario seem overly pessimistic.

The eurozone presents a different picture. Lacking strong AI momentum, economic growth is expected to hover around just 1%. The drag from U.S. tariffs is offset by increased defense and infrastructure spending, inflation will approach the 2% target, and the European Central Bank is likely to maintain its current policy stance.This regional divergence actually reflects that the global economy is entering an era in which technological shocks are redrawing the boundaries of growth. Whoever goes further in AI applications will be the first to break through in the productivity race.

Investment Outlook: The Cyclical Rotation from Growth Stocks to Value Stocks

Vanguard's Capital Markets Model offers striking ten-year expected returns: US stocks are expected to return 4.0%-5.0% annually, non-US global stocks 4.9%-6.9%, and US bonds 3.8%-4.8%. This means that, on a risk-adjusted basis, high-quality fixed income assets, US value stocks, and developed non-US market stocks are becoming more attractive choices.

Why has the AI boom dimmed the outlook for US growth stocks? Vanguard offers two reasons. First, the market has already priced in extremely high earnings growth for tech giants, and any data that falls short of expectations could trigger valuation compression. Second, historically, major technological innovations are often accompanied by intense "creative destruction," as new entrants erode the profit pools of incumbent leaders. This precisely explains why Vanguard's forecast for overall US equity returns is so modest, with large-cap tech stocks being the main drag.

Conversely, as the benefits of AI spread from hardware and platforms to the broader real economy, those "traditional" companies that can improve efficiency by adopting AI, as well as global companies in overseas markets, may become the real winners. Vanguard believes that economic transitions are often accompanied by shifts in equity market style, and the relative performance of value stocks and overseas equities will gradually improve.

The Return of Fixed Income: Bonds Once Again a Core Allocation

After years of a low-interest-rate environment, the bond market has returned to investors' attention. Vanguard emphasizes that high-quality US bonds (including taxable and municipal bonds) offer attractive real returns at current yield levels, with expected returns close to current coupon levels and clearly higher than expected inflation. More importantly, if the growth expectations driven by AI ultimately fail to materialize, bonds' safe-haven properties will provide a buffer for portfolios. Therefore, regardless of what central banks do in 2026, the long-term value of bond allocations has been established.

Lessons for Long-Term Investors

Vanguard's outlook charts a clear path: firmly hold a globally diversified portfolio, moderately reduce exposure to US growth stocks, and increase exposure to high-quality bonds, value stocks, and non-US equities. This advice seems counterintuitive, especially when tech stocks continue to lead. But history shows that the investment returns of technological revolutions are often not linear, but rather exhibit structural rotation. Investors who maintain discipline during bubble periods and seek opportunities beyond consensus will ultimately be able to ride through cycles.The macroeconomy and asset pricing in the AI era are forming new logic. Optimists see productivity leaps, while cautious observers see overstretched valuations. Vanguard's report, however, builds a rational bridge between the two. For global investors, 2026 may not be a year for chasing trending opportunities, but rather one for recalibrating asset allocation and preparing for long-term growth.