Books that should be read before starting a Ph.D. in economics

Suppose a young person is going to start a Ph.D. in economics. What essential readings would you recommend prior to this?

In my opinion, the Ph.D. in economics involves a heavy emphasis on tools. But the story isn’t told, about why we are building these tools. The intuition isn’t built, about the world out . . . → Read More: Books that should be read before starting a Ph.D. in economics