In the early 1970s, when Wall Street was going through a particularly bad time, it actually cost more money to buy a taxi medallion—a license to own and operate a taxicab in New York City—than it did to purchase a seat—a license to trade—on the New York Stock Exchange.
The reason was simple enough. In the 1930s, the city had frozen the number of taxi medallions, in order to keep otherwise- unemployed people who happened to own cars from going into the taxi business and competing with professional cabdrivers. New York City, in other words, created a taxi cartel, and the fortunate medallion holders have been making out like bandits ever since.
There’s a lesson here. While we still tend to think of monopolies and cartels as the product of top-hatted 19th-century plutocrats conspiring against the public good, the major combinations in restraint of trade in this century have been government-sponsored, and just as pernicious.