For example, if you tell me my job is to cook the french fries, I will resist anything that threatens the existence of french fries, since when they go away, so does my job. But if you tell me my job is to make side dishes for customers, I'll be open to changing from fries to onion rings or other side dishes, even ones we've yet to invent, since my identity isn't tied to a particular side dish but instead to the role side dishes play.
