The scenario described involves a decrease in both the price and quantity of new computers. This situation typically indicates a shift in demand or supply.
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An increase in the number of buyers would generally lead to an increase in demand, likely increasing both price and quantity, which doesn't match the described outcome.
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A decrease in supply due to a decrease in manufacturing costs would likely decrease prices but would typically increase the quantity supplied, which would not result in a decrease in quantity.
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A decrease in demand due to a decrease in buyer income could lead to a decrease in both price and quantity, as consumers have less income to spend and may buy fewer computers.
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A decrease in demand due to an increase in the number of sellers is a bit counterintuitive. Typically, more sellers would increase supply, so this would not lead to a decrease in quantity at the same time.
Given the possibilities provided, the most likely explanation for a decrease in both price and quantity of new computers is:
A decrease in demand due to a decrease in buyer income.