Answer:
The quantity demanded at $3 would be 18 units.
Explanation:
The market demanded curve is the sum of all individual demand curves in the market. We can sum up the individual quantity demanded of a good to find out the quantity demanded by the market as a whole.
Suppose the price of a good is $3. There are three consumers in the market.
The first consumer would buy 6 units, the second would buy 5 units and the third would buy 7 units.
The market demand for the good at the price of $3 would be,
= 6 units + 5 units + 7 units
= 18 units