# The Great Mental Models Volume 3  ## Metadata - Author: [[Rhiannon Beaubien and Rosie Leizrowice]] - Full Title: The Great Mental Models Volume 3 - Category: #books ## Highlights - feedback to others. There are two basic types of feedback loops: balancing and reinforcing, which are also called negative and positive. Balancing feedback loops tend toward an equilibrium, while reinforcing feedback loops amplify a particular process. ([Location 144](https://readwise.io/to_kindle?action=open&asin=B09G3K5W2R&location=144)) - Systems are rarely static. They are continuously adjusting toward equilibrium, but they rarely stay in balance for long. In our lives we often act like we can reach an equilibrium: once we get into a relationship, we’ll be happy; once we move, we’ll be productive; once X thing happens, we’ll be in Y state. But things are always in flux. We don’t reach a certain steady state and then stay there forever. The endless adjustments are our lives. ([Location 544](https://readwise.io/to_kindle?action=open&asin=B09G3K5W2R&location=544)) - _ Liebig's law of the minimum refers to the idea that a plant's growth will be limited by the nutrient that is least available. Yield is thus constrained by resource limitation. ([Location 574](https://readwise.io/to_kindle?action=open&asin=B09G3K5W2R&location=574))