This document discusses the need for businesses to act like digital startups by embracing principles like moving fast over perfection, prioritizing digital assets over physical infrastructure, focusing on platform businesses over linear models, and solving problems at a global scale. It emphasizes that in order to become a radically digital business, companies must react to changes, rebound from failures or challenges, and reimagine their business through initiatives like partnerships, reinventing brands, or civic technology projects. The document suggests that reacting, rebounding, or reimagining are critical responses for businesses, and asks which one is most important.