What if someone told you that you could dramatically reduce the crime rate without resorting to coercive policing or incarceration? it sounds too good to be true. But it's been borne out by the research of Chris Blattman, Margaret Sheridan, Julian Jamison, and Sebastian Chaskel. Their new study provides experimental evidence that offering at-risk men a few weeks of behavioral therapy plus a bit of cash reduces the future risk of crime and violence, even 10 years after the intervention. Sustainable Transformation of Youth in Liberia ... offered men who were at high risk for violent crime eight weeks of cognitive behavioral therapy. [Economist Chris] Blattman wanted to formally study just how effective this kind of program could be. He decided to run a big randomized controlled trial with 999 of the most dangerous men in Monrovia, recruited on the street. The 999 Liberian men were split into four groups. Some received CBT, while others got $200 in cash. Another group got the CBT plus the cash, and finally, there was a control group that got neither. A year after the intervention, the positive effects on those who got therapy alone had faded a bit, but those who got therapy plus cash were still showing huge impacts: crime and violence were down about 50 percent. 10 years later ... crime and violence were still down by about 50 percent in the therapy-plus-cash group. Blattman estimates that there were 338 fewer crimes per participant over 10 years. [The program] cost just $530 per participant. That works out to $1.50 per crime avoided.