Graphically, the market demand curve is: the vertical sum of individual demand curves. the horizontal sum of individual demand curves. greater than the sum of the individual demand curves. O steeper than any individual demand curve that is part of it. A market is in equilibrium: at all prices above that shown by the intersection of the supply and demand curves. whenever the demand curve is downsloping and the supply curve is upsloping. if the amount producers want to sell is equal to the amount consumers want to buy. provided there is no surplus of the product. Sn so SA Price Quantity Using the graph above, a change from Point A to Point E represents a(n): increase in quantity supplied. increase in supply. O decrease in supply. decrease in quantity supplied.