The book focuses on the "uncertainty" the world is facing which leads to numerous challenges to global economy. As the global economy grapples with the complexities of the "risk triangle" and microeconomic entities experience significant "oxygen depletion", the challenge of managing uncertainty, moving beyond zero-sum paradigms, and stabilizing the development of expectations has emerged as a critical mission for all countries, including major economies such as China, the United States, Europe, and Japan. The author tries to reveal the key fact behind the economic development in respond to recession economics, that is the economic growth in long term relies on endogenous tecnological advancements and continuous improvements in human capital. It aims to equip readers with the knowledge to find "certainty" in an "uncertain world".