

Interview: Adam Alter, NYU marketing professor and author of Irresistible, on nine-enders, fluency, and naming that sells
Oct 1, 2025
Adam Alter, an NYU marketing professor and bestselling author, dives into the nuances of how behavioral science influences decision-making. He discusses intriguing concepts like 'nine-enders,' a phenomenon where significant life choices often occur at ages ending in nine, shaping marketing strategies. Alter emphasizes the impact of fluency in communication—how simpler, more pronounceable names build trust. He also explores the power of context in decision-making, demonstrating how environment and language can construct perceived value in products.
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From Being Stuck To Finding Research
- Adam Alter recounts being stuck as an undergraduate and sampling many courses before choosing psychology and law.
- That exploration led him to research and a PhD in the U.S., launching his academic career.
Unexpected Environmental Forces Shape Behavior
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The Power Of Nine‑Enders
- People approaching ages that end in nine introspect and evaluate life's meaning more intensely.
- This spike explains increases in milestones like marathon running and in riskier behaviors like extramarital site sign-ups.