For over a decade, U.S. equities dominated most portfolios almost by default — exceptional tech leadership, a monetary regime that favored the dollar, and capital concentration did the heavy lifting. That regime shifted in 2025. The MSCI All Country World ex-USA Index returned roughly 26–32% in USD terms, decisively outpacing the S&P 500's 15–17% gain — the widest margin of international outperformance since 2009.
The dispersion underneath that number is the real story. South Korea's KOSPI returned somewhere in the 64–76% range. Spain's IBEX 35 was up near 48–49%. Japan's Nikkei 225 gained 24–26%, Germany's DAX 22–23%, and France's CAC 40 posted solid, if more modest, gains — held back somewhat by its heavier weighting toward luxury and industrials. None of this reads as a short-term anomaly; it's a function of relative valuation, fiscal and monetary divergence between regions, a broadening AI supply chain, and real governance reform in markets like Japan and Korea.
I read shifts like this through a structured set of indicators rather than headlines: growth and cyclical momentum (GDP differentials, composite PMI, industrial production), monetary conditions (real policy rates versus neutral, central bank liquidity, yield curve shape), valuation gaps (forward P/E, CAPE, EV/EBITDA relative to history and peers — right now the S&P 500 trades near 23x forward earnings against many international markets at 12–21x), external accounts and currency (current account balances, real effective exchange rates), and fiscal and governance quality (debt trajectories, reform momentum, policy predictability).
On the modeling side, I use regime-classification techniques (Markov-switching, PCA across growth/inflation/policy variables) to identify where we sit in the cycle, factor-based allocation models that blend classic equity factors with macro overlays like real equity carry, and relative-valuation frameworks — including mean-reversion models for currencies and multiples — to estimate how much of a valuation gap is likely to actually close, rather than assuming it will.
Where that points right now: Europe, on the back of fiscal expansion (particularly Germany's infrastructure and defense spending) and improving earnings; Japan, on continued governance reform and shareholder-return momentum; and Korea and Taiwan, as direct beneficiaries of the broadening AI hardware cycle at more reasonable valuations than U.S. large-cap tech. That view holds only as long as the data supports it — the discipline is in updating the framework, not defending a call.