More Guns, Less Crime is a book by John Lott that examines how violent crime rates change when states pass "shall issue" concealed carry laws. He presents the results of his statistical analysis of crime data for every county in the United States during 18 years from 1977 to 1994. The book expands on an earlier study published in 1997 by Lott and his co-author David Mustard in The Journal of Legal Studies. Lott also examines the effects of gun control laws, including the Brady Law.
Below are summaries of the main topics discussed in More Guns, Less Crime.
Shall issue laws
Lott examines the effects of shall issue laws on violent crime across the United States.
His conclusion is that shall issue laws, which allow citizens to carry concealed weapons, steadily decrease violent crime. He explains that this result makes sense because criminals are deterred by the risk of attacking an armed victim. As more citizens arm themselves, the danger to criminals increases.
Lott examines the effects of training requirements on crime rate and accident rate. He finds that training requirements have very little effect on both crime rates and accident rates.
Lott examines the effects of waiting periods. These include limiting the time before purchasing a gun, and limiting the time before obtaining a concealed carry permit.
Lott examines the effects of the Brady law.
Lott spends some time discussing gun ownership rates and crime rates in other countries, such as the United Kingdom.
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