The dangers of being abandoned when ill—both material and political dangers—explain why sick people are happy to be supported, and why others are eager to provide support. In part, it’s a simple quid pro quo: “I’ll help you this time if you’ll help me when the tables are turned.” But providing support is also an advertisement to third parties: “See how I help my friends when they’re down? If you’re my friend, I’ll do the same for you.” In this way, the conspicuous care shown in our medical behaviors is similar to the conspicuous care shown in charity; by helping people in need, we demonstrate
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