Final answer:
A large bank is outsourcing janitorial and maintenance duties by contracting with a custodial service, enabling it to focus on its core financial services and avoid the need for significant extra funds for non-core activities.
Step-by-step explanation:
When a large bank contracts with a custodial service company to provide janitorial services and light maintenance duties for them, they are engaging in a process known as outsourcing. This allows the bank to focus on its core competencies, like providing financial services to customers and dealing with financial securities, without having to invest in and manage non-core functions such as cleaning and maintenance. The arrangement also dovetails with the bank's operational strategy where they do not need substantial extra funds for activities not directly tied to their primary services. For instance, the benefit that a local bank does not need to have significant extra funds to make a loan, because the bank plans to sell the loan shortly after its origination, pooling it into a financial security.