The economy has been run based on some assumptions: geography is not essential in the age of technology, skilled workers drive city development, and investments are driving city economy growth. But what if some or all of these assumptions are wrong? What if everything is about to change? The core argument of this book is to answer some questions and make the reader closer to urban science. So, what can learn in urban economics course which we don't learn in microeconomics or macroeconomics courses? What do policymakers and citizens need to know about the city? Why do we need to learn urban changes? What kinds of cities are exist? What does it mean for developers?