1. AP Economics Mr. Bernstein Module 6: Supply and Demand – Supply and Equilibrium October 7, 2014

2. AP Economics Mr. Bernstein Competitive Markets An institution which brings together buyers and sellers of particular goods or services Local, national or international Face-to-face, electronic or other impersonal Assumption: no buyer or seller so large they affect pricing Will look at markets which are not perfectly competitive later in the course 2

3. AP Economics Mr. Bernstein Supply Schedule and Supply Curve 3

4. AP Economics Mr. Bernstein Law of Supply All other things equal, as price increases the quantity supplied rises So there is an direct relationship between price and quantity supplied Plotted on a graph, the law of demand infers an upward sloping supply curve Note: It will be important to distinguish between a change in the “quantity supplied” and a change in “supply” 4

5. AP Economics Mr. Bernstein Supply Shifters Factors which change supply other than price An increase in supply shifts the supply curve to the right A decrease in supply shifts the supply curve to the left Notice an increase in supply shifts the supply curve horizontally, not vertically 5

6. AP Economics Mr. Bernstein A Shift in Supply is different from movement along the Supply Curve!! 6

7. AP Economics Mr. Bernstein A Shift in Supply is different from movement along the S Supply Curve!! 7

8. AP Economics Mr. Bernstein Supply Shifters Input or Resource prices Increase in the price of inputs causes a decrease in the quantity supplied Prices of related goods Increase in the price of Substitute Goods’ price causes a decrease in the quantity supplied (production shifts to higher price substitute product) Technology Advances in technology increases the quantity supplied 8

9. AP Economics Mr. Bernstein Supply Shifters, cont. Expectations Expectations of future price increases decreases the quantity supplied today Number of producers More producers increase the quantity supplied 9

10. T - RICE Supply Shifters: T - RICE T T echnology R R elated prices (substitutes, compliments) I I nput prices C C ompetition (number of producers) E E xpectations AP Economics Mr. Bernstein 10

11. AP Economics Mr. Bernstein Equilibrium Equilibrium is the point where no buyers or sellers would be better off changing price or quantity AKA “Market-clearing” price Market prices are like a pendulum, swinging back and forth. At equilibrium, they are stable 11

12. AP Economics Mr. Bernstein Equilibrium: Where Supply and Demand Curves Intersect 12

13. AP Economics Mr. Bernstein Equilibrium Prices Fall When There is a Surplus 13

14. AP Economics Mr. Bernstein Equilibrium Prices Rise When There is a Shortage 14