What is the term for the total number of units that are purchased at that price?

Quantity demand

Explanation:

Quantity demand is known to be the amount of goods and services which a consumer desire to purchase and pay for at a specified period of time. A consumer must be willing to buy a product during the time it is needed at a price which he or she can pay for it in the market. Thus, as the price of a good rises, consumer will purchase less and as the price of a good falls, consumer will purchase more of the good.

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