Coke vs. Pepsi. Ford vs. GM. Nike vs. Reebok. HP vs. IBM. The last 100 years or so have seen great business rivalries, brutal and unforgiving in their intensity. This article contains 50 of the very important and provide great insights into the rivalry and who evenually won the war. Even personalities make the list (Thomas Edison vs. Nikola Tesla; Bill Gates vs. Steve Jobs). A great list, albeit US-centric, that is really worth going through.

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