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Learn about supply and demand dynamics, supply shifters, and equilibrium in competitive markets. Explore how price affects quantity supplied, supply curve shifts, and the concept of market equilibrium. Master the key concepts in AP Economics.
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AP Economics Mr. Bernstein Module 6: Supply and Demand – Supply and Equilibrium October 7, 2014
AP EconomicsMr. 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
AP EconomicsMr. Bernstein Supply Schedule and Supply Curve
AP EconomicsMr. 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”
AP EconomicsMr. 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
AP EconomicsMr. Bernstein A Shift in Supply is different from movement along the Supply Curve!!
AP EconomicsMr. Bernstein A Shift in Supply is different from movement along the S Supply Curve!!
AP EconomicsMr. 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
AP EconomicsMr. Bernstein Supply Shifters, cont. • Expectations • Expectations of future price increases decreases the quantity supplied today • Number of producers • More producers increase the quantity supplied
AP EconomicsMr. Bernstein Supply Shifters: T - RICE • Technology • Related prices (substitutes, compliments) • Input prices • Competition (number of producers) • Expectations
AP EconomicsMr. 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
AP EconomicsMr. Bernstein Equilibrium: Where Supply and Demand Curves Intersect
AP EconomicsMr. Bernstein Equilibrium Prices Fall When There is a Surplus
AP EconomicsMr. Bernstein Equilibrium Prices Rise When There is a Shortage