Marketplace Metrics

When to Use This Skill

Use this skill when you need to:

• Define the core health metrics for a two-sided marketplace
• Build a metrics dashboard for tracking marketplace performance
• Identify supply/demand imbalances and liquidity problems
• Create reporting frameworks for marketplace growth analysis

DO NOT use this skill for SaaS metrics (use saas-metrics-dashboard), financial modeling, or investor reporting. This is for operational marketplace health metrics.

Core Principle

MARKETPLACE HEALTH IS NOT ABOUT TOTAL USERS — IT IS ABOUT WHETHER SUPPLY AND DEMAND ARE FINDING EACH OTHER. LIQUIDITY IS THE METRIC THAT MATTERS MOST.

Phase 1: Brief

Required Inputs

GATE: Confirm the brief before defining the metrics framework.

Phase 2: Define Core Metrics

Tier 1: Marketplace Health (Track Weekly)

Tier 2: Side-Specific (Track Monthly)

Supply Metrics:

Demand Metrics:

Tier 3: Unit Economics (Track Quarterly)

GATE: Confirm which metrics to prioritize before designing the dashboard.

Phase 3: Build the Dashboard

Dashboard Layout

Top row (KPI cards): GMV | Take Rate | Liquidity | Active Buyers | Active Sellers

Row 2 (Trends):

• GMV trend (12 months, line chart)
• Supply vs. demand trend (dual-axis line chart)

Row 3 (Health indicators):

• Liquidity by category (bar chart)
• Match rate trend (line chart)
• Buyer/seller activation funnels (funnel charts)

Row 4 (Cohort analysis):

• Buyer cohort retention (heatmap)
• Seller cohort retention (heatmap)

Alert Thresholds

Phase 4: Polish

1. Marketplace Diagnostic Framework

When a metric looks bad, diagnose with this flowchart:

GMV is flat or declining: → Check buyer count. Is it growing? If no → demand problem. → Check average transaction value. Is it dropping? If yes → pricing or mix shift. → Check transaction frequency. Is it dropping? If yes → engagement or quality problem.

Liquidity is low: → Too much supply? → Raise seller quality bar, pause seller recruitment. → Not enough demand? → Increase buyer acquisition spend. → Matching problem? → Improve search, categories, or recommendations.

2. Reporting Template

## Monthly Marketplace Report — [Month Year]

### Key Metrics
| Metric | This Month | Last Month | Change |
|--------|-----------|-----------|--------|
| GMV | | | |
| Take Rate | | | |
| Liquidity | | | |
| Active Buyers | | | |
| Active Sellers | | | |
| Repeat Buyer Rate | | | |

### Highlights
- [Top achievement or milestone]
- [Growth in a key metric]

### Concerns
- [Metric trending in wrong direction]
- [Action being taken to address it]

### Focus for Next Month
1. [Priority 1]
2. [Priority 2]

3. Quality Checklist

## Marketplace Metrics Checklist

- [ ] GMV tracked and trending monthly
- [ ] Take rate calculated correctly (revenue / GMV)
- [ ] Liquidity measured by category (not just overall)
- [ ] Supply and demand tracked separately with activation rates
- [ ] Match rate or search success rate is measured
- [ ] Buyer and seller retention tracked by cohort
- [ ] Unit economics (LTV, CAC) calculated quarterly
- [ ] Alert thresholds set for critical metrics
- [ ] Monthly reporting template is in use
- [ ] Diagnostic framework available for when metrics decline

Example

Marketplace: Local home services Monthly snapshot:

GMV: $145,000 (+12% MoM)
Take Rate: 14%
Platform Revenue: $20,300
Liquidity: 34% (34 of 100 listed contractors got a booking)
Active Buyers: 280
Active Sellers: 100
Supply/Demand Ratio: 1:2.8
Repeat Buyer Rate: 41%

Diagnostic: "Liquidity at 34% suggests we have more contractors than buyer demand can absorb. Recommendation: pause contractor recruitment, increase buyer acquisition spend by 30%, and launch a referral program for buyers."

Anti-Patterns

• Tracking GMV without take rate — GMV means nothing if you are not capturing revenue. Always pair them.
• Ignoring liquidity — a marketplace with 10,000 listings and no transactions is a graveyard. Liquidity is the true health indicator.
• Treating both sides the same — buyer and seller metrics must be tracked separately. A healthy buyer side can mask a dying seller side.
• Vanity metrics — total signups, page views, and app downloads tell you nothing about marketplace health. Track activity and transactions.
• No cohort analysis — aggregate retention hides whether new cohorts are performing better or worse than older ones.

Recovery

• No transaction data yet (pre-launch): Track supply-side metrics (listings, seller signups, listing quality) and demand signals (waitlist signups, search queries).
• Liquidity is very low: Narrow the marketplace scope. Focus on one category or one geography until liquidity exceeds 30%.
• Cannot calculate LTV yet: Start with average transaction value and repeat rate. LTV calculation becomes meaningful after 6+ months of data.
• Metrics are inconsistent: Define every formula in a data dictionary. Ensure buyer, seller, and transaction definitions are used consistently.