Cash in the Wall

In the 1960s, if you needed cash on a Saturday, you were completely out of luck. The global banking system operated on rigid business hours, forcing society to plan its financial life around the schedule of bank tellers. Then, inspired by a machine that dispensed chocolate bars, inventor John Shepherd-Barron developed the first Automated Teller Machine (ATM). It was a mechanical revolution that fundamentally rewired consumer behavior and the global economy. This business history book uncovers the immense logistical and psychological hurdles of deploying the first ATMs. From engineering the secure four-digit PIN—chosen simply because Shepherd-Barron's wife could not remember six digits—to convincing a highly skeptical public to trust a metal box with their life savings, the rollout was a masterclass in behavioral design. Learn how the ATM became the absolute foundation of modern fintech. It is a story of how automating a single, mundane task destroyed the physical monopoly of bank branches and birthed the 24/7 financial accessibility we take for granted today.