Traditional agency economics often tie capacity directly to headcount. More accounts require more permanent people, more layers and more coordination. New tools give small teams another option: keep judgement concentrated while expanding research and production capacity around it.
Elastic capacity changes the shape of the agency
A small senior team can now explore more routes before committing, produce more variants after a decision and automate pieces of operational work that used to consume expensive human attention. That does not make every task instant. It changes where the bottleneck sits.
The scarce resource becomes judgement: knowing what matters, choosing a direction, editing aggressively and taking responsibility for the result.
Do not confuse small with thin
The aim is not to under-resource projects. It is to avoid building layers that exist mainly because the operating model requires them. Specialists still matter. Human expertise still matters. The team can simply be assembled around the problem rather than preserved forever on an org chart.
Scale the work before you scale the payroll. Then add people where people make the result materially better.