I do know that much of Boston had no choice but to take a day off on Friday. I know the Bruins game was cancelled, and that Comic Con was "postponed" and likely cancelled because of the difficulty of re-booking the conference center anytime before next year.
Not even considering the salaries and overtime of the officers involved, it is not wrong to say that this manhunt may have cost hundreds of millions, perhaps billions of dollars in economic losses. For example, some of the speculation from The Washington Post this afternoon:
http://www.washingtonpost.com/blogs/wonkblog/wp/2013/04/19/t...
This is as if an entire city went into anaphylaxis.