In New York, the price of a pizza slice and a subway ride have been the same for 50 years. A rise in one predicts a rise in the other.

In New York, the price of a pizza slice and a subway ride have been the same for 50 years. A rise in one predicts a rise in the other.

New York City is known for many things. Two of the most common are it's subway system and pizza by the slice. These two NYC trademarks have an interesting connection. In 1980, native New Yorker Eric Bram proposed the "Pizza Principle."

This economic law, while slightly humorous, is also historically very accurate. Bram noted that since the 1960s, the price of a slice of pizza in NYC corresponded very closely with the price of one subway token. What's more, a rise in one could predict a rise in the other.

This was proven again in 2005 and 2007 when the price of pizza increased. Correspondingly, subway fares also rose in 2009 and 2013. New Yorkers would do well to keep an eye on the price of pizza if they value their public transportation.

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