US Exceptionalism, AI and Towards the Total Portfolio

AllianceBernstein

Inigo Fraser Jenkins

Research

230 Pages

AllianceBernstein examines how deglobalization, AI, demographics, public debt, and climate change are reshaping the long-term investment landscape. The authors argue that AI-driven productivity gains may offset aging populations while supporting the case for continued US equity exceptionalism—but not necessarily a stronger US dollar. They conclude that lower expected returns and weaker diversification call for a shift toward a total portfolio approach.

You can also read the 24 page executive summary. 

Key Takeaways

Aging meets AI: Public debt across the G7 is at its highest level relative to GDP since World War II, while shrinking working-age populations make AI-driven productivity increasingly important.
US remains exceptional: The US represents roughly 75% of the MSCI World Index despite accounting for about 26% of global GDP, underscoring its outsized equity market leadership.
Diversification evolves: The book spans 9 chapters across 225 pages, concluding that lower expected real returns and greater allocations to private assets strengthen the case for a total portfolio approach.
From March 7, 2000, through March 26, 2026 | Source: FactSet, MSCI and AB
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