What are some potential sources of opportunity?

Economist Peter F. Drucker identified the following sources of business opportunity ...

1. The unexpected success, failure, or outside event
2. The incongruity between reality as it actually is and how reality is perceived
3. Innovation based on process need
4. Changes in industry structure or market structure that catches everyone unaware
5. Demographic (population) changes
6. Changes in perception, mood, and meaning
7. New knowledge, both scientific and nonscientific