When low-priced products sold in one market make their way across segments into markets where higher prices would normally prevail, this is called a: Black market phenomenon
What is black market?
The black market is any economic activity that takes place outside of government-sanctioned channels. Illegal market transactions are usually conducted "below the table", allowing participants to circumvent government price controls and taxes. Goods and services offered on the black market may be illegal, meaning that the law prohibits their sale, or they may be legal but traded to avoid taxes.
Illegal markets are also known as illicit markets, shadow markets, or underground markets.
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