The Peter Principle
According to Dr. Peter, every position in a hierarchy will sooner or later be filled by someone incompetent for that position. Considering the current hiring and promotion practices all over the world, this should come as no surprise. Sadly, little has changed on that front over the past 50 years.
Waterfall
Locus of control is one of the most important psychological predispositions, yet few people are talking about it. If you're in business or thinking of going into business, then you need to understand it.
Motivation is one of the biggest dream-killers in existence. It's right up there with fear of failure, procrastination, and Netflix. That's why motivational videos on YouTube get millions of hits while the people watching them go through the motions. And why so few live with purpose and intent.