Noted: Over all, unreported income amounts to roughly $2 trillion annually, but cash wages make up only a portion of that estimate, according to Edgar L. Feige, an emeritus professor of economics at the University of Wisconsin, Madison, who has spent decades examining underground and cash economies, in part by using information on how much cash is in circulation at any given time. There is no way of knowing how many workers are earning their salaries in cash, Professor Feige said.
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