Excess Returns

What War Charts and AI Bubbles Miss | The Weekly Market Insight – March 8, 2026

Mar 9, 2026
Rob Arnott, founder of Research Affiliates and value-investing veteran, and Andy Constan, an investment practitioner with a credibility-assessment framework. They discuss how to judge expert commentary, why war-after-market charts mislead, separating belief in AI technology from belief in AI stocks, defining bubbles via implausible growth assumptions, and why small-cap value may rebound after long slumps.
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INSIGHT

Separate AI As A Discovery From AI Stocks

  • Kai Wu separates belief in AI technology from belief in AI stocks or economic outcomes.
  • Jobs are bundles of tasks, so AI will both substitute and augment specific tasks within roles, reshaping daily work.
ADVICE

Audit Jobs Task By Task For AI Risk And Opportunity

  • Analyze jobs at the task level to decide which tasks AI will replace vs augment.
  • Kai Wu suggests automate hated, repetitive tasks and reallocate human time to high‑value client interaction and judgment.
INSIGHT

A Bubble Means Implausible Growth Assumptions

  • Rob Arnott defines a bubble as prices that require implausible DCF growth assumptions to justify current valuations.
  • He notes some winners (Amazon, Apple) exceed those assumptions, but most overvalued firms fail to deliver.
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