Who would have thought that, on Friday 13th January, the value of Apple Computer, Inc. would exceed that of Dell Inc. But that is exactly what happened, as Steve Jobs has pointed out in an internal memo. To be precise, Apple's stock closed up at $85.59 for a value of $72.132 billion while Dell's stock closed down at $30.58 for a value of $71.971 billion. No guarantee that Apple will retain the lead but an interesting moment in history nonetheless.
The growth of Apple and collapse at Dell seem to be basically attributable to how much a company innovates. It also suggests that increasing market share is not necessarily a driver for increasing value on capital invested.