The Personality Test Industrial Complex: The MBTI Problem

Why MBTI Took Over Corporate Culture Despite Weak Science, and What to Use Instead

Dr. Leslie Poston traces how the Myers-Briggs Type Indicator became a multi-million-dollar corporate fixture despite decades of research challenging its psychometric quality, from Katharine Cook Briggs and Isabel Briggs Myers' Jung-inspired typology to its commercialization by the Myers-Briggs Company. The episode outlines core problems with the MBTI, including poor test-retest reliability, arbitrary binary categorization despite normally distributed traits, and weak predictive validity for workplace outcomes. Poston covers why it still feels accurate through the Barnum/Forer effect, motivated reasoning, preference for simple categories, and social identity dynamics reinforced by online communities and corporate incentives. She contrasts the MBTI with evidence-based personality science such as the Big Five and HEXACO, notes the growing commercial availability of validated tools, and examines why the MBTI persists through ease of use, positivity, institutional inertia, and cultural saturation.

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00:00 MBTI Everywhere

01:31 Origins and Jung

03:30 The Business Machine

04:33 Reliability and Validity Issues

07:55 Why It Feels True

12:27 Big Five and Better Models

17:04 Why MBTI Still Dominates

20:08 What You Can Do

22:15 Bigger Lesson and Wrap