Apple CEO Tim Cook may be required to testify in an antitrust lawsuit the United States Department of Justice filed against it and major e-book publishers over an alleged price fixing of e-books. Cook's eventual testimony might be risky and could be potentially damaging to his company, now the main target of the suit after all named publishers had settled with regulators.

On the other hand, the CEO could take the opportunity to make a public case for a so-called agency model that the government claims has had anti-competitive impact. The agency model regulates the relationship between Apple and digital content owners who get to pick their iBook prices freely as long as they agree not to offer lower pricing to competitors than they do to Apple.

Business-wise, publishers prefer Apple's policy over Amazon's wholesale model where the online retailer sets prices as it sees fit, often hurting publishers' bottom line by engaging in selling books at a loss just to draw shoppers to its online store...