Barriers to entry

An entry barrier is not merely something difficult or expensive. The question is whether a potential rival can enter or expand on a timely and sufficient scale, with a reasonable prospect of recovering the required commitment, in the market and period being analyzed.

Relevant conditions can include licenses, patents, standards, scale economies, network effects, switching costs, data, scarce inputs, distribution, reputation, installed base, compatibility, financing, sunk investment, location, and strategic incumbent response. The categories can interact.

Cost alone is not enough

Incumbents also incurred many ordinary costs. A large expenditure can be a barrier when entrants face an asymmetry, irrecoverable commitment, scale gap, coordination problem, or delayed path that prevents timely discipline. A small formal fee can matter when paired with a scarce authorization or long approval process.

Evidence should address attempts, failures, expansion, minimum viable scale, lead time, expected post-entry price, access terms, customer switching, and incumbent responses. Announced entry without actual ability to discipline the market is weak evidence.

Capitalized assets, expenses, commitments, and contracts can inform the entry record. Their accounting classification does not decide economic recoverability or competitive significance by itself.