Competitive advantage: Often overlooked, frequently misunderstood, and generally underappreciated, it may be the most important factor investors should consider before taking a long-term stake in a company. In this video, Motley Fool Co-Founder and Chief Rule Breaker David Gardner presents three critical aspects of competitive advantage -- brand, distribution, and vision -- and looks at companies that possess them in spades
Back in the late 1990s, many people underestimated Amazon
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