If/Then

What We Actually Learn From Experience

11 snips
Mar 25, 2026
Steven Callander, Herbert Hoover Professor at Stanford GSB who builds theoretical models of learning, discusses correlated learning and why outcomes across similar choices are linked. He explains models like Brownian motion, job-search and mechanic examples, and how this logic shapes decisions about markets, experts, and finding product-market fit.
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INSIGHT

How Correlated Learning Links Nearby Choices

  • Correlated learning means outcomes of nearby choices are similar so experience transfers across alternatives.
  • Steven Callander models alternatives as a continuous space using Brownian motion so nearby jobs/products yield nearby outcomes.
ANECDOTE

Job Search Example Shows When To Jump Or Stay Nearby

  • A new graduate hates a job at Goldman Sachs and must decide next steps based on similarity of alternatives.
  • Callander explains Morgan Stanley is close in the job space (likely similar outcome) while a financial planner in Ohio is far and less correlated.
INSIGHT

Brownian Motion Gives Structure To Learning

  • Brownian motion represents the mapping from alternatives to outcomes as a continuous random walk so nearby alternatives produce nearby outcomes in expectation.
  • This mathematical structure makes the intangible idea of 'learning across alternatives' analyzable and actionable.
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