Here is a link to a review of a new book - Stealth of Nations by Robert Neuwirth
"Stealth of Nations by Robert Neuwirth. It is a mind-blowing book because it is the first in our time to attempt a broad look at the meaning of all this unregulated, untaxed, unofficial economic activity. Neuwirth estimates that fully half the world’s workers are involved at some level in what he calls System D.
This is the sector that is variously called the “underground” and the “informal sector.” He prefers System D (the street term derived from the African French word for highly motivated people) because it is nonjudgmental. It refers simply to the sector of economic life that exists “outside the framework of trade agreements, labour laws, copyright protections, product safety regulations, anti-pollution legislation and a host of other political, social and environmental policies.”
He documents the amazing workings of System D and demonstrates that it is the world’s second-largest economy, amounting to economic productivity of $10 trillion, which is probably a low estimate. At the pace at which government is growing, System D is set to employ as many as two of three workers by 2020. "