CReasoned. A method brief using standard concentration measures. Thresholds are indicative, to be set for each business.
Many e-commerce businesses grow on a single marketplace account. That is efficient until the account is suspended, a listing is blocked, fees change or a policy update arrives. The risk is rarely zero, but it can be measured, and measuring it changes how a business plans.
Three measures
| Measure | How to calculate | Why it matters |
|---|---|---|
| Top-channel share | Share of contribution margin (not revenue) from the largest channel or account | The share of profit exposed to one set of rules |
| Concentration index | Sum of the squared margin shares of all channels (Herfindahl–Hirschman style) | One number that rises as dependence concentrates |
| Weeks of cover | Cash plus sellable stock elsewhere, divided by weekly fixed costs | How long the business survives if the largest channel stops |
Run the same measures for suppliers (share of purchase value) and for markets (share of margin by country). A business can be diversified by channel and still rely on one factory.
Early-warning signals
- Account health metrics drifting towards platform thresholds: defect rates, late shipment, policy warnings.
- Rising share of sales from one or two products on the dominant channel.
- Announced fee or policy changes with an effective date.
- Regulatory changes in the dominant market, for example new product safety or packaging rules.
What to do when the numbers run high
- Protect the account first. Monitor health metrics weekly, document compliance, keep a second person able to act on the account.
- Diversify where margin allows. A second marketplace, an own store, or wholesale channels, chosen on contribution rather than revenue.
- Keep a contingency plan written down. Who acts, which stock moves where, which customers are contacted, within the first 72 hours.
The useful question is not “could this happen?” but “how many weeks could we run if it did?” A business that can answer it has already started managing the risk.
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