Market penetration

Costco describes membership choices and the lagging renewal calculation. The disclosure helps distinguish continuing relationships from new adoption. It does not reveal maximum willingness to pay, an eligible nonmember denominator or a causal effect of a particular acquisition tactic.

Dropbox’s registration statement distinguishes cumulative registrations from active paid licenses and describes routes to paid conversion. The actual commercial choice lets people enter through a free service and offers additional paid capabilities. Growth in those reported stocks can indicate more activity under their definitions, but the stocks do not identify how much of a consistently defined eligible market the product serves. The manager’s decision is whether to attract previously unserved customers, deepen current use or convert an existing free need into a viable paid relationship. Those actions require different denominators. A duplicate registration can increase a count without adding another person; another paid license can expand an existing customer without penetrating a new household or organization. The filing does not give the eligible population needed to calculate the proposed market share. Define the customer, task, geography and period first. Then distinguish new adoption, expansion and conversion before treating aggregate account growth as penetration or assigning a tactic its causal contribution.