California marijuana sellers contend with online black market

Marijuana displayed at a Los Angeles store on the first day of recreational marijuana sales in California. Photo: Christina House / Los Angeles Times via Getty Images

"Craigslist for cannabis ... Online ads from unlicensed pot shops roil California market," AP's Michael Blood reports from L.A.

Why it matters: "The dispute over the online ads goes to basic economics for an emerging market sprung from what was mostly an illegal one: Lawful operators will struggle if they're competing with a robust black market that can undersell them."