Before revision: A black market in Shinbashi in 1946 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.
After revision: A black market in Shinbashi in 1946 Illegal street traders in Barcelona in 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.