As I’ve struggled to find a film to write about, I thought I’d write about a feature of Covid that is particularly philosophically relevant: you can be infected but be asymptomatic. So you must make decisions under uncertainty, not knowing whether you are sick or contagious—victim or vector.

Suppose we were to ask for each country on Earth how many people would willingly choose to live in it, given complete freedom of choice, but under a modified version of the veil of ignorance. Which country would you choose?