Which innovative pharmaceutical pricing strategy was first widely implemented in the early 2000s to increase access to HIV/AIDS medications in developing countries?

The pharmaceutical industry has developed various pricing models to balance innovation costs, market access, and patient affordability. Over the decades, these strategies have evolved significantly in response to regulatory changes, public pressure, and market dynamics. This trivia tests your knowledge about a groundbreaking pricing innovation that changed how life-saving medications are made available in developing nations.

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Tiered pricing (charging different prices based on a country's economic development level)
Subscription model (countries pay a fixed annual fee for unlimited access to certain medications)
Patent pooling (where multiple companies share intellectual property rights for humanitarian purposes)
Value-based pricing (setting prices based on quantifiable patient outcomes rather than per pill)