Tim Harford is 'The Undercover Economist'. I recommend the book highly - it's way better than 'Freakonomics' when it comes to rigor while explaining economic phenomenon. Freakonomics succeeds partly because of its explanation of more bizarre phenomenon.
Harford however has the kind of mischievous curiosity that really means he is up to no good. Most of the time you'll find him trying to figure out the mysteries behind really mundane stuff.
In this delightful piece he explains the mysterious lack of the 8 oz. Starbucks espresso option.