Final answer:
The requirement for firms to maintain accounts for each individual subscriber is variable and based on the industry and regulatory context. Companies often keep detailed records for billing, compliance, and service quality reasons.
Step-by-step explanation:
The statement "Firms must maintain accounts for each individual subscriber" can be true or false depending on the context and the specific industry regulations. Typically, companies in various sectors like telecommunications, utilities, and subscription-based services are required to maintain records for each individual subscriber for billing purposes, regulatory compliance, and to provide personalized services.
However, the details of such requirements can vary greatly from country to country and amongst different industries. In general, from a business perspective, it is essential for a firm to maintain accurate and up-to-date accounts to manage its operations effectively. This process includes tracking revenues, expenses, and providing customer support and since subscribers are integral to the firm's revenues, accounts related to them are usually meticulously kept.