Body: "Commerce of black markets" is the field of an underground economy where drugs, firearms, etc. are illegally traded.
Several topics in "Commerce of black markets" include drug trade, organ trade, weapons trade.
because the black market will continue to exist as long as their are regulations and taxes is some of the cause to investigate "Commerce of black markets".
A few notable experts of "Commerce of black markets" include Mark M. Pitt, Robert Augustus Hardy, Julia R. Norgaard.