Quantity demanded is a flow variable, which means that it must be expressed

Question

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Quantity demanded is a flow variable that represents the amount of a good or service that consumers are willing and able to purchase during a specific period of time, such as per day, week, month, or year. Therefore, it must be expressed as a number of units per period of time. Options A, B, and D specify a specific period of time, but they are not the only possible time frames for measuring quantity demanded. Option E refers to a specific moment in time, which is a stock variable, not a flow variable.

Quantity Demanded Is a Flow Variable, Which Means That It