Adding extra Value in Economics subject is very difficult. There are hundreds of books in different economic aspects. Countless textbooks available in the market, what else we can add some value to it? There are two completely different ways for value added, one is trying to simplify this subject, making it more understandable for the general public. There are many authors already tried to simplify this subject. The other is creating in depth analysis in some specific topics in this subject. The approach of this study guide is taking a new balance between academic difficulty and readability for the general public.In this ultra-short guide for Microeconomics, I will try to simplify the core content of a standard university level course into a very short guide. I am an expert for this as I am a professional tutor for this subject for more than 10 years. My students study economics courses in four different continents, including London School of Economics, Walton business School in US, ANU in Australia and Asian Universities like HKU. Seldom have people teaching for this subject have such kind of exposure of different teaching style in various universities. This book is suitable for people who are interested in Economics subject but don't have time for detail study. It is also suitable for students who are now studying university level economic related course in different subject, like business faculty students, engineer related students. Many subjects have at least one to two courses related to economics. Like many of us need to study statistics for academic training in university even we may not need it at all. You can use it as an ultra-quick helping guide to get a pass in this subject. I will try to make it simple but still have some level of explain and examples. You can understand the concepts from this book even you don't have any economics background. I will also add a few math illustrations for some university level reader to handle some typical questions in their exam. If some reader tells me this guide is helpful for them, I will be very gladded.