Final answer:
The government's mandate for unleaded gas in cars is an example of protecting the environment, as it aims to reduce air pollution and the harmful effects of lead. Such regulations are classified as command-and-control policies in pollution control.
Step-by-step explanation:
The government's mandating the use of unleaded gas in new cars is primarily an example of protecting the environment. When the government sets regulations for car emissions, this is done to reduce air pollution, which benefits public health and the overall environmental quality. Historically, leaded gasoline was a major source of air pollution, releasing toxic lead into the atmosphere, which can have serious health impacts. By mandating unleaded gas, the government is aiming to keep the air cleaner and protect citizens from the harmful effects of lead exposure.
Looking at other options, such a mandate does not primarily aim to help specific workers or industries, nor does it directly stabilize the economy or provide public goods. However, by creating a cleaner environment, it indirectly benefits the broader society and can contribute to economic stability by reducing healthcare costs associated with pollution-related illnesses. The mandate would be classified under command-and-control policies in pollution control, where the government sets specific standards or limitations on emissions. By contrast, a market-incentive based policy would involve mechanisms like taxes or permits to encourage firms to reduce emissions.