When it comes to business, no one works it better than the Big Apple. New York City beat out London, Paris, Tokyo and Hong Kong as the No. 1 business center in the world, according to a survey of the world's 66 busiest cities by Bloomberg Rankings. But the survey noted that in 10 to 20 years, Beijing and Shanghai could give NYC a stiff challenge for the top spot. The results were based on criteria such as business activity, cultural amenities and political influence.