To borrow an idea from Tyler Cowen, here’s a really interesting sentence:

After crunching the numbers, he calculates that on a weekday, the average car driven into Manhattan south of 60th Street causes a total of 3.26 hours of delays to everybody else.

That’s from a Felix Salmon blog post on Charles Komanoff’s study of the externalities associated with driving in New York. Since my spell checker doesn’t know the word “externalities,” I’ll link to its definition as well.