Reputation math: how one star of rating change affects revenue for a $500k/year local business

Publishing Day 74 (July 7, 2026).

This article covers:

• The Michael Luca / Harvard Business School rating-revenue research, updated for 2026
• Applied math for a $500k/year single-location business at each half-star band
• Why the effect is asymmetric — losses hurt more than gains help
• The break-even calculation on time spent on reputation work

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