Viral E Commerce and Flash Sales

iPhone Launch Sale: A System Where 10 Million Users Try to Purchase 5,000 Phones

Design a launch-day system where 10 million users compete for just 5,000 iPhones. Explore CDN-based traffic absorption, auditable random queues, adaptive admission control, atomic inventory reservations, payment recovery, and anti-scalping mechanisms that keep the system fair without overselling a single device.