Turn to page 7 for a list of more than 50 publicly traded companies in the payment industry worldwide. This group excludes full-service commercial banks with card issuing and acquiring businesses. Also mentioned are more than a dozen other payment industry firms owned by private equity companies that are candidates for initial public offerings (IPOs) of common stock. This month PayPal become publicly traded for the second time since being founded in 1998. The company, which processed $235 billion in payments from more than 4 billion transactions last year, began trading on Nasdaq on July 20...