Depends how good the offer is. If the offer is low, you should obviously ask for more. If not, you don't need to. But you should have an idea what you think y

Depends how good the offer is. If the offer is low, you should obviously ask for more. If not, you don't need to. But you should have an idea what you think you're worth. Otherwise how do you know when to say yes? If you always ask for 2x, how do you know that the other guys didn't start by offering you a quarter of what you're worth?