Kate Raworth’s Doughnut economics - meeting the needs of all people (a social foundation) within the means (boundaries) of the living planet. What we like is both the visual simplicity of the model and the fact that it still makes you challenge EVERYTHING – as it really promotes different ways of thinking instead of a fixed set of rules. Apply it to the scale that is relevant and palatable for your case/cause: your person, your company, your country and eventually the world.