At a price of $12, the three consumers in a market demand 5, 8 and 11 units of a good. At a price of $16, they demand 3, 6 and 9 units. Using these figures, explain how market demand is derived from individual demand and what the results show about the relationship between price and quantity demanded. The figures are invented.

Paper 2-style short part (standalone practice; not an IB question).