Economy of New York City 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. Finance, high technology, real estate, insurance, and health care all form the basis of New York's economy. The city is also the nation's most important center for mass media, journalism, and publishing.
Concentration of media ownership Corus Entertainment and Shaw Communications), Rogers Communications, Quebecor, and the government-owned CBC/Radio-Canada. Each of these companies holds a diverse mix of television, specialty television, and radio operations. Bell, Rogers, Shaw, and Quebecor also engage in the telecommunications industry with their ownership of internet providers, television providers, and mobile carriers, while Rogers is also involved in publishing. In 2007, CTVglobemedia, Rogers Media and Quebecor all expanded significantly through the acquisitions of CHUM Limited, CityTV and Osprey Media, respectively. In 2010, Canwest Global Communications, having filed for bankruptcy, sold its television assets to Shaw (through a new subsidiary, Shaw Media) and spun