Big Apple
"Big Apple" is a nickname for New York City. It was first popularized in the 1920s by John J. Fitz Gerald, a sports writer for the "New York Morning Telegraph". Its popularity since the 1970s is due in part to a promotional campaign by the New York tourist authorities.
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.