Mental models are especially important when we are faced with complex problems because it gives us the ability to see the world from multiple perspectives.Unfortunately, however, we often tend to view reality through a single lens and divide it into discrete topics.This point is well illustrated in The Great Mental Models: Most of us are learning something, rather than being exposed to other disciplines at the same time to develop a more macro view. We don't have a multidisciplinary mindset, so we can only see things from one perspective. To better navigate the complexity of stock market, we need what Charlie Munger calls a 'mental model grid' (shown below).Grids are a great way to conceptualize mental models because they show the interconnectedness of knowled