Apple's market value has reached four times that of Dell: Apple's profit is much greater than that of PC computers.

By May 1, Apple's market value has reached four times of Dell. Analysts think that innovation, integration and customer service are the keys to Apple's success.

Michael Dell, CEO of Dell Inc, once said on October 2nd, 1997, that if he became the CEO of Apple, he would close the company and return the money to the shareholders. However, in a twist of irony, by January 2006, Apple's market value exceeded Dell's for the first time, and now it has reached four times of Dell's.