Supply
Supply Schedule P Qs Oranges $4/lb. 1.2 million $3/lb. 1million $2/lb.
Law of Supply As P , QS (As P , QS ) There is a direct relationship between P and QS NOT As P , S NOT As QS , P NOT As S , D
Supply Curve P S $4 $3 $2 Qs .5m 1m 1.2m Oranges
Supply Curve P S P2 P1 Qs Q1 Q2 Oranges
Shape and Slope of a Supply Curve Positive (slopes upward from l-r) Why? Law of Supply (direct relationship between P and Q) Why true? Profit Motive TR – TC = Profit (Total Revenue – Total Cost)
Shape and Slope of a Supply Curve Curved (not a straight line) Why? Law of Increasing Marginal Cost (the flower pot effect)
Supply Curve P S Q capacity Oranges
A change in price can only cause: A change in quantity supplied, not a change in supply. A change in quantity supplied is shown as a movement along the supply curve. A change in supply refers to a movement of the entire curve.
Supply Curve *Suppliers are now willing and able to supply more at every price. P S S1 An increase in supply is a shift to the right. (Decrease is a shift to the left.) P1 Q Q1 Q2 Oranges
Determinants of Supply What causes a change in supply (a movement of the entire curve) Change in the number of suppliers Change in the cost of production