"US underground economy doubles from 2009 to 2012"

A recent study by Edgar Feige, an economist at the University of
Wisconsin-Madison, suggests that the size of the underground economy
in the U.S. in 2012 reached $2 trillion. A study done by Friedrich
Schneider, a professor at Johannes Kepler University in Linz, Austria,
suggests that this figure was only $1 trillion in 2009. The underground
economy, also known as the gray and black markets, is the business activity
that does not get reported to governments and taxed. This underground
economy includes everything from activities banned by the state, such
as selling certain drugs and weapons, to off-the-books jobs in fields
as diverse as childcare and construction.

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http://www.examiner.com/article/us-underground-economy-doubles-from-2009-to-2012