John Lott and John Whitley said, “We find evidence that legalizing abortion increased murder rates by around about 0.5 to 7 percent.”
Full Citation: Lott, John R. and Whitley, John E.,Abortion and Crime: Unwanted Children and Out-of-Wedlock Births(April 30, 2001). Yale Law & Economics Research Paper No. 254. Available at SSRN: http://ssrn.com/abstract=270126 or DOI: 10.2139/ssrn.270126
Donohue and Levitt say “abortion is just as negatively related to crime as in our original analysis.” When taking into account the years between 1985 to 1997, “legalized abortion is once again strongly associated with reductions in crime.”
To read the entire report, click on Further Evidence that Legalized Abortion Lowered Crime.