Dominant companies always look invulnerable–until they’re very vulnerable. That’s been the case throughout the modern history of technology, with IBM, Microsoft, Yahoo, and MySpace all once upon a time seeming secure at the top of the mountain. And then, one by one, each was toppled (though Microsoft is still a $638 billion company).
Such is the case today, as four companies–Google, Apple, Facebook, and Amazon–vie for tech’s Iron Throne (with a combined market cap of $2.61 trillion). But while there are no credible contenders for the crown today, who knows what will happen a few years down the line.
Image: Flickr user Jean-Pierre Dalbéra