black market

noun

Etymology: Ca. 1930, probably a calque of German Schwarzmarkt, which is attested from the 1910s. Compare Schwärzer (“smuggler”, 18th c.).

1. Trade that is in violation of restrictions, rationing, or price controls.

   “Peace and order will not be tolerated. Start saving your cash for the black market, folks, you're gonna need it.”

   “In District 12, a dirt-poor coal-mining community that looks like a Dorothea Lange photograph, Katniss Everdeen (Jennifer Lawrence) quietly rebels against the system by hunting game in a forbidden area with her friend Gale (Liam Hemsworth) and trading it on the black market.”

2. The people who engage in such trade, or that sector of the economy.

   “associational black market”