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What has caused the evolution of drug-resistant strains of HIV?
Pollution Permits
Licenses issued by government authorities that allow holders to emit a specific amount of pollutants over a set period, intending to control and reduce environmental damage.
Supply And Demand
A fundamental economic model describing how the quantity of goods supplied by producers and the quantity demanded by consumers determine the price and quantity of goods and services in a market.
Gas Tax
A government-imposed tax on the sale of gasoline, primarily used to fund transportation infrastructure projects.
Optimal Level
The most efficient, effective, or desirable point or degree for a specific purpose or condition.
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