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As a knowledgeable finance professor, I want to introduce you to the concept of performance bonds in futures trading. These are necessary deposits that customers must maintain in their accounts, in addition to the initial margin. They act as a safety net to cover any potential losses in a futures position. If the equity in a customer's account drops below the maintenance performance bond level, a "performance bond call" is issued, requiring them to deposit enough money to restore their equity back to the initial margin level. This ensures that the customer's account remains secure and able to continue trading.