Which company first successfully implemented the 'razor and blades' business model, selling the base product at a low cost while making profit on necessary refills or accessories?

Throughout history, inventors and businesses have revolutionized not just what they sell, but how they price their innovations. Some pricing strategies were so groundbreaking they changed entire industries and how consumers interact with products. Test your knowledge of these pivotal pricing strategy innovations that shaped modern commerce and consumer behavior.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Gillette (with safety razors and replacement blades in the early 1900s)
Eastman Kodak (with cameras and film in the 1880s)
Singer (with sewing machines and thread/needles in the 1850s)
Edison (with phonographs and recording cylinders in the 1870s)