Black market
Transportation providers

Where taxicabs, buses, and other transportation providers are strictly regulated or monopolized by government, a black market typically flourishes to provide transportation to poorly served or overpriced communities. In the United States, some cities restrict entry to the taxicab market with a medallion system (taxicabs must get a special license and display it on a medallion in the vehicle). In most such jurisdictions it is legal to sell the medallions, but the limited supply and resulting high prices of medallions have led to a market in unlicensed carpooling / illegal taxicab operation. In Baltimore, Maryland, for example, it is not uncommon for private individuals to provide illegal taxicab service for city residents.
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