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...become common to distinguish between qualitative and quantitative approaches, some researchers argue the need for combining these two types of method, and there are those who challenge the distinction itself. For example, they argue that it obscures both the considerable diversity that exists under each heading and also important overlaps. These are certainly vital points...

...become out of date and inferior to those of the competition, so companies must update products with features that customers value or completely replace the product. Market leadership can change as new products are developed that give greater benefits than old ones. For example, the Sony Walkman was the market leader in portable music players. Following its launch, the...