underground economy

China's mid-Autumn Festival and its tradition of eating mooncakes has lent itself to an underground economy worth billions.

If the word 'cybercrime' conjures up images of computer geeks trying to crash computers from their mothers' basements, think again.

Best estimates are that about 15% to 20% of the world's economy happens off the books. Journalist Mischa Glenny takes a tour of the underground economy in his new book, "McMafia." He talks about it with Kai Ryssdal.