Interview Questions › Root Cause Analysis

GMV is flat, but all health metrics are moving slightly

Total platform Gross Merchandise Value (GMV) is completely flat YoY ($50B), but all underlying sub-metrics are moving in conflicting directions: merchant count is +18%, active buyers are -8%, average order value (AOV) is +12%, and purchase frequency is -5%. Conduct a comprehensive multi-variable diagnostic.

Context

Executive leadership wants to understand if the business is quietly eroding under the surface or undergoing an organic structural shift.

Clarifying questions to ask first

• Is the AOV increase driven by higher item prices (inflation) or more items per cart?
• How is merchant churn and new merchant GMV contribution trending?

How to approach it

1. Deconstruct GMV equation: GMV = Merchants × Active Buyers × (Orders / Buyer) × Average Order Value (AOV)
2. Segment by Merchant Tier (Enterprise Plus vs High-Volume DTC vs Long-tail Hobbyists)
3. Analyze consumer macro inflation impact on order basket sizes vs discretionary spending frequency
4. Evaluate cohort health and long-term customer lifetime value (LTV)

Framework: Mathematical First-Principles Equation Breakdown -> Merchant Tier Segmentation -> Inflationary Price Effect vs Volume Erosion -> Strategic Portfolio Health Assessment

Sample answer

• Inflation masked underlying consumer volume decay; fewer shoppers buying higher-priced goods
• Long-tail merchant churn offset by massive GMV growth in top 1% enterprise merchants
• DTC apparel and electronics slowing down while B2B wholesale merchants grew

1. Breakdown reveals: Units sold fell 15%, but merchant list prices rose 20% due to supply chain inflation; top 5% enterprise merchants now represent 78% of all GMV while SMB merchants are suffering high attrition

Flat GMV is a dangerous false stability: price inflation masked a 15% unit volume drop and SMB merchant distress; recommended strategic pivot to B2B enterprise capabilities and SMB financing support.

What interviewers look for

• GMV by Merchant Cohort
• Merchant Gross Margin %
• Buyer Repeat Purchase Rate
• Basket Size (Units per Order × ASP)