Business Quality
SDE margin as a percentage of revenue, modified by years in business.
- 25%+Strong margin
- 15–25%Moderate margin
- <15%Weak margin
Tenure modifier: businesses operating 10+ years receive a stability bonus. Under 3 years, a stability discount.
SDE margin is the single best proxy for operational efficiency and pricing power. Thin-margin businesses have no slack — one bad quarter and you can't service debt. Fat-margin businesses survive shocks.