it reduced the number of teenage mothers, not some broader effect of reducing all unwanted pregnancies. 2020 updated study by Donohue and Levitt In 2020 a study by Donohue and Levitt was published in American Law and Economics Review to review the predictions of the original 2001 paper. Overall the authors concluded that the predictions did hold up with strong effects. "We estimate that crime fell roughly 20% between 1997 and 2014 due to legalized abortion. The cumulative impact of legalized abortion on crime is roughly 45%, accounting for a very substantial portion of the roughly 50-55% overall decline from the peak of crime in the early 1990s." Levitt discusses this paper and the background and history of the original paper (including its criticisms) in an episode of the Freakonomics podcast. See also Lead–crime hypothesis Freakonomics by Levitt and Stephen J. Dubner; Chapter 4 discusses this effect. Freedomnomics by John R. Lott Jr.; Chapter 4 discusses this effect. Statistical correlations of criminal behaviour Roe effect Title X Unintended pregnancy References Further reading Barro, Robert J. "Does Abortion Lower the Crime Rate?" (Archive). BusinessWeek. September 27, 1999. Abortion debate Criminology