Behind the Big Board's Big Bet

The NYSE-Euronext hookup may bring drastic changes to the way stocks are traded. Here's what you need to know

The Big Board is looking to get a lot bigger. On June 2, New York Stock Exchange owner NYSE Group (NYX) and European exchange operator Euronext unveiled a deal to create the world's biggest securities marketplace, a trans-Atlantic behemoth valued at $20 billion. The merger could have implications for investors and publicly traded companies worldwide, provided it can leap through international regulatory hurdles.

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