If all the money in the U.S. only totals $6 trillion, how can the New York Stock

The New York Stock Exchange (NYSE), nicknamed the "Big Board," is a New York City-based privately-owned stock exchange by the NYSE Group (NYX). It is the largest stock exchange in the world by dollar volume and the second largest by number of companies listed. Its share volume was exceeded by that of NASDAQ during the 1990s, but the total market capitalization of companies listed on the NYSE is five times that of companies listed on NASDAQ. The New York Stock Exchange has a global capitalization of $17.4 trillion, including $7.1 trillion in non-U.S. companies. The NYSE is operated by NYSE Group, which was formed by merger with the fully electronic stock exchange Archipelago Holdings. The New York Stock Exchange trading floor is located at 11 Wall Street, and is composed of five rooms used for the facilitation of trading. The main building is listed on the National Register of Historic Places and is located at 18 Broad Street, between the corners of Wall Street and Exchange Place. NYSE Group is acquiring Euronext, and many of its operations (particularly IT and the trading platform) will be combined with that of the New York Stock Exchange and NYSE Arca.