Lines of Control: The Invention of the Barcode and the Silent Takeover of Global Retail

The familiar beep at the grocery store checkout is so ubiquitous that it has become entirely invisible to us. Yet, prior to 1974, every single item in a supermarket had to be individually marked with a price tag and manually keyed into a register, creating staggering logistical bottlenecks and massive inventory errors.

The solution required an engineering miracle that bridged the gap between physical objects and digital data. The invention of the Universal Product Code (UPC) and the laser sc...