Can You Outsmart an Economist? is an excellent book of puzzles put together by Steven Landsburg. Steve includes a lot of classics such as the Girl Named Florida Problem, the Potato Paradox and Newcomb’s paradox, the former two problems are presented in slightly different and in the first case improved forms so you might not recognize them on first reading. Steve also includes many economic puzzles, Bayes puzzles, common knowledge problems and more. Readers of this blog will certainly know some of the puzzles but will also find lots of novel problems and puzzles. Also included are philosophical paradoxes. For example, the headache problem.
A billion people are experiencing fairly minor headaches, which will continue for another hour unless an innocent person is killed, in which case the headaches will cease immediately. Is it okay to kill that innocent person?
The puzzle here isn’t the answer. The answer is obvious. The puzzle is that smart people can’t agree which answer is obvious.
Overall, this is the best and most diverse collection of puzzles that I know. It’s meant to be dipped into and sampled at leisure. My only complaint is that the puzzles are followed by answers which makes it too easy to fool yourself into thinking you always knew the answer! Answers in the back of the book would have been a minor form of commitment. Recommended.