The following article was written by Megan McArdle and published in TheAtlantic.com on October 19, 2007:
An economic analysis of the bike commute
In which we consider the costs, as well as the benefits, of riding our bike to work.
Riding our bike to work means that we may occasionally be attacked by marauding curbstones. On the benefit side, we are not being mugged by auto-mechanics, or unpleasant dictatorships with thoroughly undeserved good luck in geography. Overall, the bike is still a clear winner.
(If you click on the link to the article, you can see a photo of one of the "costs" of bike commuting)