Merryn Talks Money Live From The Master Investor Show: Jim Mellon and Stephen Yiu
May 1, 2026
Stephen Yiu, Blue Whale fund manager focused on bottom-up tech and AI-adjacent stock picking. John Stepek, journalist covering UK macro, debt and policy. Jim Mellon, investor and Burnbrae chair with macro, commodities and AI perspectives. They debate US and UK debt risks, AI data-center demand vs overcapacity, investing in AI infrastructure and suppliers, robotics, demographics and the role of energy and commodities.
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UK Debt Is The Root Political And Economic Problem
- UK faces deep structural weakness driven by high public debt and low resilience, limiting policy options and investment in infrastructure.
- John Stepek highlights debt-to-GDP near 95% and mortgage rate rises squeezing housing and consumer activity, constraining government fiscal room.
US Government Debt Is The Major Global Pinch Point
- The US fiscal position is a systemic risk with federal plus state and private debt creating vulnerability to a dollar devaluation.
- Jim Mellon notes $39tn federal debt, ~130% total debt-to-GDP and rising fiscal deficits funded by monetary expansion.
Prefer Bottom Up Picking In US Equities
- Focus on bottom-up stock selection in the US because many profitable companies are net cash and resilient despite macro risks.
- Stephen Yiu says ~70% of his fund is in American businesses with strong balance sheets and high margins.