Tyler Cowen, noting that drastic fall in violent crime during the 90s may be partly explained by the fall in popularity of crack cocaine, speculates on the reasons that the cocaine business, unlike the marijuana business, is so associated with violent crime.

Is it more due to intrinsic properties of cocaine, such as its addictive nature, and its being a stimulant instead of a depressant? Or is it due to extrinsic features of the drug, such as its centralized production outside the U.S.?

Perhaps some light could be shed on the matter by comparison with the crystal methamphetamine business. I’m not an expert, but from what I’ve read it would seem that crystal meth shares a lot intrinsic properties (such as being a stimulant) with cocaine, but shares with marijuana extrinsic properties such as decentralized production.

If there’s a high rate of violence associated with the crystal meth business, we should look to the intrinsic properties of cocaine to explain the violence associated with the cocaine business, whereas if there is not, we should look to production factors to explain the difference between the cocaine and marijuana businesses.