Recently, many business owners say that "Selection and Concentration" is important. But some of them had been aimed at the opposite, i.e. "Diversity", before. That means that "Selection and Concentration" is not eternal truth, but it might be changed to the opposite depending upon the trend of times.
Other than this, there are many opposite poles. For example, it is such as "Heterogeneous" vs. "Homogeneous", "Centralize" vs. "Decentralize", "Universal" vs. "Specific" and "Mass” vs. "Niche" etc.
The important thing is which side of poles you should now focus and execute your business along with this pole depending upon the trend of times. But, it is also important that you could shift to the opposite pole depending upon the trend of times like a swing.