Why 'Signups' Is the Wrong North Star for a Marketplace
A two-sided marketplace is deciding on its North Star metric.
Per this subject's canonical example, why is "total signups" a weaker choice than an alternative like "successful transactions completed"?
The correct answer is "Signups don't guarantee anyone actually received value from a match."
This subject's canonical marketplace example is direct: a signup, on either the buyer or seller side, is a necessary precondition but doesn't guarantee anyone received value — optimizing signups in isolation can even make the metric look great while the business gets worse (heavy signup-side spend attracting users who never transact). "Successful transactions completed" only increases when a real match happened between a buyer's need and a seller's supply, which is the closest single number to the value the marketplace actually exists to create.
The distractors miss the actual reasoning: measurement difficulty isn't the stated objection to signups — signups are typically easy to measure, which is part of why they're a tempting but flawed choice; a "legal reporting requirement" for transactions isn't something this subject claims at all; and "no meaningful difference" contradicts the subject's entire point — it explicitly ranks successful transactions as the stronger North Star and names the specific reason why.
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