中金2026年展望 | 美国宏观：供需新变局（要点版）

Core Viewpoint - The U.S. economy in 2025 is experiencing significant divergence, with traditional industries like manufacturing and real estate under pressure from tariffs and immigration policies, while the technology sector is seeing a surge in capital expenditure driven by the AI wave [2][3] Supply Side: Tariff and Population Pressure - The supply contraction in the U.S. economy is expected to persist due to increased tariffs and a slowdown in population growth, with the effective tariff rate rising from 2.4% last year to 9.8% this year [5][6] - Immigration policies have tightened, leading to a significant decrease in new immigrants, with labor force growth projected to drop from an average of 1.5% during the Biden administration to 0.6% during Trump's second term [6][8] - The potential for productivity improvement through AI is acknowledged, but it is expected to take time to materialize, with estimates suggesting AI could contribute approximately 0.2 percentage points to annual productivity growth by the early 2030s [7][8] Demand Side: Capital Expenditure Cycle Fluctuations - The AI investment cycle is anticipated to face volatility, with AI contributing about 0.7 percentage points to U.S. real GDP growth in the first half of 2025, but the marginal returns on capital are expected to decline as investment scales up [10][11] - The current phase of AI investment is heavily focused on data centers and hardware, resembling a "new infrastructure" cycle, with 2025 likely being the peak for investment growth [10][11] - The cost of AI infrastructure is projected to be significantly higher than during the internet bubble era, influenced by high inflation and tariffs, which may lead to increased sensitivity among investors regarding returns [11][12] Fiscal, Monetary, and "Stagflation" Risks - Fiscal and monetary policies are expected to see marginal easing, but the overall stimulus effect is likely to be limited, with the Trump administration's "Great Beautiful Act" potentially increasing the fiscal deficit by about 0.8 percentage points in 2026 [19][20] - The Federal Reserve is likely to lower interest rates cumulatively by 50 basis points in 2026, with the federal funds rate expected to end the year in the range of 3%-3.25% [19][20] - The U.S. economy is currently exhibiting "stagflation" characteristics, with rising material costs and declining consumer confidence, necessitating vigilance against further "stagflation" risks in the first half of 2026 [20][21]