# Buyer Momentum Index (BMI): How to Know When a Car Is About to Sell

## Visibility Is Not Enough
Visibility tells you where a car appears. Momentum tells you what happens next.

## The Four Signals
1. Engagement Efficiency - do views turn into interest (gallery, features, finance check, save)?
2. Intent Acceleration - how fast do buyers act after first contact?
3. Drop-Off Performance - where do buyers leave the journey?
4. Substitution Resistance - do buyers view your car, then similar ones, then contact someone else?

## A High BMI
Does not mean "cheap" - it means "convincing": fast understanding, no hesitation, no need to keep searching.

## Actionable
Shows why buyers engage, where they hesitate and when they switch away - and what to fix now (photos, description, response speed, feature clarity).