Industries are evolving to ecosystems.  As part of an IBM Academy of Technology study, we explored multiple business ecosystem concepts.  But ecosystems are complex and difficult to understand.  Simulation is one way to explore ecosystems.  We built a business ecosystem simulator, to (1) ask whether a proposed ecosystem “works”, (2) to explore proposed ecosystem improvements, and (3) to explore disruptive scenarios (COVID, change economic interest rate, hire/fire staff, …).  The simulator was written in Java and based on an open-source simulation package.  The simulator helped us evaluate different scenarios.