Hospitality is costly. It costs time, effort, and money. It’s a form of generosity. But hospitality gives us social capital. It allows us to earn our friends’ trust so we can talk about things that matter. And if we’ve been generous to them, then they will most likely reciprocate by listening to our views, even if they don’t agree with what we’re saying. Hospitality also makes the host vulnerable—we’re opening up our private homes to our guests. But in doing so, hospitality invites the guests to be vulnerable in return.