Which pricing strategy, implemented by King C. Gillette in the early 1900s, later became famous when adopted by tech companies and is credited with revolutionizing how many modern digital products are sold?

In the world of inventions and discoveries, pricing strategies have often determined which technologies become mainstream and which fade into obscurity. Some of history's most successful innovations succeeded not just because of their technical brilliance, but because of revolutionary pricing approaches that changed consumer behavior and market dynamics. This trivia question explores one such pivotal pricing strategy that transformed an entire industry and helped establish one of the most significant technological ecosystems of the modern era.

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The razor-and-blades model (selling the base product cheaply while profiting from necessary consumables)
The freemium model (basic features free, premium features paid)
Penetration pricing (initially low price to gain market share, then gradually increasing)
Dynamic pricing (constantly adjusting prices based on demand and market conditions)