Big Apple
Although the history of "Big Apple " was once thought a mystery, a clearer picture of the term's history has emerged due to the work of amateur etymologist Barry Popik, and Gerald Cohen of Missouri University of Science and Technology. A number of false theories had previously existed, including a claim that the term derived from a woman named Eve who ran a brothel in the city. This was subsequently exposed as a hoax.
Economy of New York City
Manhattan is the nation's leading center of banking, finance, and communication. It is home to the New York Stock Exchange (NYSE) on Wall Street. Many of the world's largest corporations are headquartered in Manhattan. The borough contained over 500 million square feet (46.5 million m) of office space in 2015. This makes it the largest office market in the United States. Midtown Manhattan, with nearly 400 million square feet (37.2 million m) that same year, is the largest central business district in the world. New York City is distinctive for its high concentrations of advanced service sector firms in the law, accountancy, banking and management consultancy fields. It is the top global center for the advertising industry, which is metonymously called "Madison Avenue". Silicon Alley, metonymous for New York's broad-spectrum high technology sphere, continues to expand.