Final answer:
Full service firms are also known as brokerage or investment banks, offering a comprehensive suite of financial services such as investment advice, wealth management, and security trading.
Step-by-step explanation:
Firms sometimes referred to as "full service firms" are also known as brokerage firms or investment banks. These entities offer a wide range of services, including investment advice, wealth management, research, underwriting of new securities issues, and executing buy or sell orders for clients. In essence, they can handle most aspects of investment on their own without requiring their clients to seek additional services elsewhere. By offering a comprehensive suite of financial services, full service firms cater to clients who prefer to have all their investment needs managed under one roof.