Rolling a Fatty

Since Washington and Colorado have legalized marijuana, the pot business has been veering toward the mainstream. Advocates hope to legalize personal use in another 14 states by 2017, mostly among the 16 states besides Washington and Colorado where medical pot is legal. Industry estimates say today's $1.5 billion legal market could quadruple by 2018.

And as one might expect, a private-equity fund, Privateer Holdings, has been designed to buy up the smaller marijuana-related businesses to create one big fat one.....further evidence of the ubiquity of economies of scale.