Abstract:
Analyzing county level data for the entire United States from 1977 to 2000,
we find annual reductions in murder rates between 1.5 and 2.3 percent for
each additional year that a right-to-carry law is in effect. For the first
five years that such a law is in effect, the total benefit from reduced
crimes usually ranges between about $2 billion and $3 billion per year

http://papers.ssrn.com/sol3/papers.c...ract_id=372361