Big Weed: ten farms could supply all of America with marijuana

When Washington State legalized recreational marijuana three years ago, it created a licensing regime that was supposed to protect and encourage small growers, but the data shows that marijuana growing has consolidated into a few large suppliers, even as the price per gram has fallen -- and that the industry's embrace of exotic derivatives like edibles and concentrates is capital-intensive and inaccessible to small, independent providers. (more")