Which major pharmaceutical pricing strategy shift occurred in 2001 that dramatically improved HIV/AIDS treatment access in developing countries?

The pricing strategies in the pharmaceutical industry are complex and often controversial. They balance R&D costs, market competition, patient access, and profit margins. This poll tests your knowledge about one of the most significant pricing strategy shifts in modern medicine that changed how life-saving drugs are made available to patients in developing countries.

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Tiered pricing model for antiretrovirals, allowing lower prices in low-income countries
Introduction of outcome-based pricing, where pharmaceutical companies are paid based on treatment success
Subscription model pricing, where countries pay a fixed annual fee for unlimited access to specific medications
Value-based pricing system that ties drug costs directly to quality-adjusted life years (QALYs) gained