Basic Idea: By aligning yourself in a certain domain with favorable characteristics, you are more likely to have greater flexibility and reap more rewards.
Today's mental model is called Seizing the Middle. Seizing the middle is all about options. Where can we put ourselves in life and business such that, in the future, we’re more likely to have a lot of options?
Check out Shane Parrish's website Farnam Street for excellent coverage of mental models.