Abstract
Principle of 90% Change says that when a system experiences a change of 90% or more, it leads to significant transformations. This study investigates its implications across ecosystems, economies, technologies, and societies. By examining theoretical models such as rapid population destabilization following a 90% reduction, heightened financial market volatility post a 90% stock price decrease, and potential thermodynamic phase transitions with a 90% temperature reduction, alongside empirical and real-world examples such as economic collapses due to hyperinflation, ecological disruptions like coral reef bleaching, and societal shifts driven by technological innovations, the research identifies critical thresholds in complex systems. These findings emphasize both the challenges and opportunities for sustainable development and resilience strategies in an interconnected world.