Editor:
Violent crime nearly quadrupled between 1960 and its peak in 1991, then it fell and kept falling. Why?
John J. Donohue and Steven D. Levitt wrote a paper called “Understanding Why Crime Fell in the 1990s: Four Factors That Explain the Decline and Six That Do Not.”
The six factors that, according to their analysis, did not contribute to the crime drop: 1. a strengthening economy; 2. the aging of the population; 3. innovative…