We have seen that audiences import conversational implicatures from what authors and narrators explicitly say, just as we fluently recognize that fictional characters conversationally implicate things to each other. I begin this chapter by showing that this process relies on background information in the form of supporting assumptions. I then go on to discuss a final category of background information that I call default inferences. We will see that while supporting assumptions are mandatorily imported but not mandatorily generated, default inferences are optional in both senses.