What is the role of a manager in a passively managed index fund?
There is trading, and while it can be automated, someone has to define the rules for the automated system.  Why not call that person the manager?
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the role of a manager in a passively managed index fund?

### Response:
There is trading, and while it can be automated, someone has to define the rules for the automated system.  Why not call that person the manager?