In 2009, the Organisation for Economic Co-operation and Development (OECD), a think tank sponsored by the governments of 30 of the most powerful capitalist countries and dedicated to promoting free-market institutions, concluded that half the workers of the world -- close to 1.8 billion people -- were working in System D: off the books, in jobs that were neither registered nor regulated, getting paid in cash, and, most often, avoiding income taxes.