I recently stumbled on this book Economics for the Curious: Inside the mind of 12 Nobel laureates. As it says on the strap line, it is basically a collection of short articles from 12 Nobel laureates in economics edited by the Nobel laureate Robert Solow.
There are some good essays in there (e.g. Krugman on "depression economics"), but also some difficult ones follow (e.g. Nash on game theory). My favorite one was from Finn E Kydland on policy commitment. Here is a great quote on Ireland that sums up the importance of credible policy commitment :