also: やみしじょう
Refers to an illegal market where goods are traded in violation of official regulations, often during shortages or prohibition.
After the war, many people obtained food on the black market.
In that country, foreign currency is traded at high prices on the black market.
地下経済 is a more formal term for the underground economy as a whole, not limited to physical marketplaces.
Standard kanji spelling. The reading やみいちば is more common than やみしじょう.
Alternate reading using the on'yomi of 市場. Less common but still encountered.
Compound of 闇 (yami, 'darkness; illegal') and 市場 (ichiba/shijō, 'market'). The reading いちば is the native Japanese reading of 市場, while しじょう is the Sino-Japanese reading.