Explanation

Credit card ABS (Asset-Backed Securities) typically use a revolving structure because:

• Revolving nature of credit card receivables: Credit card balances constantly change as consumers make purchases and payments
• Amortization structure: Credit card ABS have a revolving period where principal collections are used to purchase new receivables rather than paying down investors
• Lockout period: During the revolving period, only interest payments are made to investors
• Amortization period: After the revolving period ends, principal payments begin

This structure allows the pool of credit card receivables to maintain a relatively stable size during the revolving period, which is essential given the dynamic nature of credit card balances.

Other types of ABS mentioned:

• Auto loan ABS: Typically have fixed amortization schedules
• Student loan ABS: Usually have scheduled amortization
• Mortgage-backed securities: Have predetermined payment schedules
• Collateralized debt obligations: Structure varies but not typically revolving
• Commercial mortgage-backed securities: Fixed payment schedules

The revolving structure is particularly suited for credit card ABS due to the revolving nature of the underlying credit card accounts.