The correct option is
A. A rise in the price of gasoline.
Detailed Explanation
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Understanding Demand: Demand refers to the quantity of a good or service that consumers are willing and able to purchase at various prices. The demand for electric cars can be influenced by several factors, including the prices of related goods, consumer income, consumer preferences, and government policies.
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Impact of Gasoline Prices: When the price of gasoline rises, the cost of operating traditional gasoline-powered vehicles increases. This makes electric cars, which do not rely on gasoline, more attractive to consumers. As gasoline becomes more expensive, consumers may seek alternatives that are more cost-effective in the long run, leading to an increase in the demand for electric cars.
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Substitution Effect: The rise in gasoline prices creates a substitution effect. Consumers will substitute away from gasoline vehicles (which are now more expensive to operate) towards electric vehicles, which typically have lower operating costs. This shift in consumer behavior directly increases the demand for electric cars.
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Consumer Preferences: As consumers become more aware of the cost savings associated with electric vehicles (EVs) in the context of rising gasoline prices, their preferences may shift towards EVs. This change in consumer preferences further contributes to the increase in demand.
Why the Other Options Are Incorrect
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B. A decrease in consumer income: A decrease in consumer income generally leads to a decrease in demand for normal goods, including electric cars, which are often considered luxury items. When consumers have less income, they are less likely to purchase higher-priced items like electric vehicles, leading to a decrease in demand.
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C. A technological advancement that lowers the cost of electric car batteries: While this scenario could lead to an increase in the supply of electric cars (as manufacturers can produce them at a lower cost), it does not directly increase demand. Demand would increase if consumers perceive electric cars as more affordable or desirable due to lower prices, but the question specifically asks for scenarios that lead to an increase in demand, not supply.
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D. A government subsidy for traditional fuel vehicles: This option would likely decrease the demand for electric cars. If the government provides subsidies for traditional fuel vehicles, it makes them cheaper for consumers, which could lead to a preference for gasoline vehicles over electric ones. This would reduce the demand for electric cars.
Summary of Key Points
- Demand for electric cars increases when gasoline prices rise due to the substitution effect and changing consumer preferences.
- A decrease in consumer income typically leads to a decrease in demand for electric cars, as they are often seen as luxury items.
- Technological advancements that lower production costs may increase supply but do not directly increase demand.
- Government subsidies for traditional vehicles can decrease the demand for electric cars by making gasoline vehicles more financially attractive.
Revision Summary
- Rising gasoline prices lead to increased demand for electric cars due to higher operating costs for traditional vehicles.
- Decreased consumer income generally reduces demand for electric cars.
- Technological advancements affect supply, not directly demand.
- Government subsidies for traditional vehicles can negatively impact electric car demand.