Good Strategy Bad Strategy: The Difference and Why It Matters

by Richard P. Rumelt

The basic definition of competitive advantage is straightforward. If your business can produce at a lower cost than can competitors, or if it can deliver more perceived value than can competitors, or a mix of the two, then you have a competitive advantage. Subtlety arrives when you realize that costs vary with product and application and that buyers differ in their locations, knowledge, tastes, and other characteristics. Thus, most advantages will extend only so far. For instance, Whole Foods has an advantage over Albertsons supermarkets only for certain products and only among grocery shoppers with good incomes who place a high value on organic and natural foods. Defining “sustainability” is trickier. For an advantage to be sustained, your competitors must not be able to duplicate it. Or, more precisely, they must not be able to duplicate the resources underlying it. For that you must possess what I term an “isolating mechanism,” such as a patent giving its holder the legally enforceable right to monopolize the use of a technology for a time.2 More complex forms of isolating mechanisms include reputations, commercial and social relationships, network effects,* dramatic economies of scale, and tacit knowledge and skill gained through experience.