Evaluating a marketplace on gross sales almost always overstates its value.
Evaluating a marketplace on gross sales almost always overstates its value. Start with truly new orders; subtract commissions, imposed promotions, logistics, returns, service, fraud, internal advertising and transfers from existing channels. Then add access value to new segments and subtract lost data, commercial dependence and price-conflict risk. A marketplace is a portfolio of economic rules, not merely a distribution point.
Decision and method.
Open or expand a marketplace only if risk-adjusted incremental contribution exceeds the cost of dependence and brand, price and service rules remain governable. Reconcile collected sales, VAT, cancellations, returns, funded promotions and refunds with orders, payment and inventory. Include product, logistics, commission, internal media, content, support, fraud and operating cost by category, basket and fulfilment. Estimate genuinely new orders and source-channel sacrifice through a control area, identifier cohort or calibrated survey. Add future value only where a credible mechanism retains or recognises the new customer. Scenario commission increases, mandatory promotions, delisting and price conflict; set a dependence cap, minimum margin and contractual exit terms.
Worked example.
A brand records €900,000 marketplace sales. After returns, revenue is €820,000. Product cost is €410,000, commission and fulfilment €205,000, advertising €72,000, service €44,000. 45% of orders are genuinely new. Own contribution: 820 − 410 − 205 − 72 − 44 = €89,000. Transferred sales would have generated €74,000 contribution on the direct site. Future value of new customers is €28,000, but only 53% is capturable: €14,800. Incremental contribution: 89 − 74 + 14.8 = €29,800, 3.3% of displayed sales. Keep the channel as capped acquisition: expansion requires incremental contribution above 5%, internal advertising below 9% of revenue and no deterioration of direct price.
Checks and limits.
Reconciled net revenue replaces displayed sales; include commission, fulfilment, media, returns and service; estimate genuinely new share and cannibalisation; document dependence cap and exit terms. Partial identity limits cross-channel transfer measurement; platform algorithms and rules can change without notice; gained visibility can create brand effects that are hard to isolate.
Resources and sources.
Download the marketplace economic account. Related: full channel cost, omnichannel transfers, govern price and channel. Sources: Hagiu & Wright (2015); Ryan, Sun & Zhao (2012); Neslin et al. (2006).