Before revision: A black market in Shinbashi in 1946 File:3 - corruption - man in suit - white background - euro banknotes hidden in right jacket inside pocket - royalty free, without copyright, public domain photo image.JPG| A black market, underground economy, or shadow economy is a clandestine market or series of transactions that has some aspect of illegality or is not compliant with an institutional set of rules.
After revision: A black market in Shinbashi in 1946 A black-market salesman (fly by night) depicted making a transaction Barcelona 2015 A black market, underground economy, or shadow economy is a clandestine market or series of transactions that has some aspect of illegality or is not compliant with an institutional set of rules.