Thornburg portfolio manager Miguel Oleaga argues that a decade of U.S. mega-cap dominance is maturing, creating a dual opportunity in undervalued international markets benefiting from corporate governance reforms and in overlooked U.S. mid- and small-caps. The Q&A also highlights a contrarian AI thesis: AI enablers may be overvalued while traditional-sector "AI users" - banks, telecoms, and outsourcers - remain mispriced relative to their potential productivity gains.