In Figure 4.3, at $15 there is: Figure 4.3 Graph-The supply and demand curve intersect; price 15 is above the point of intersection with quantity Q1 on the demand curve and quantity Q2 on the supply curve at that price; price 6 is below where the two curves intersect with quantity Q3 on the supply curve and quantity Q4 on the demand curve at that price In Figure 4.3, at $15 there is: a surplus of Q2-Q1 quantity. a shortage of Q2-Q1 quantity. a surplus of Q4-Q3 quantity. a shortage of Q4-Q3 quantity