Supply and Demand Analysis - An Introduction. Nicholas W. Papageorge Johns Hopkins University September 14, 2016
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1 - An Introduction Nicholas W. Papageorge Johns Hopkins University September 14, 2016
2 Introductions Who am I? Nicholas Papageorge. Asst. Prof. in the Economics Department. Undergrad at U. of Chicago, Ph.D. at Wash. U. in St. Louis. I was also Teach for America corps member.
3 Introductions What do I do? My research addresses questions in health, labor, pharmaceutical innovation, beliefs & risky behavior. Lately, I ve been looking at: domestic violence, personality traits, self-employment, clinical trials participation, misbehavior in school, teacher expectations & genes. My main tool is structural microeconometrics. I also run experiments to study biased beliefs.
4 A Brief Spiel Economics Congratulations on choosing Economics. Many of you will go off to be bankers or consultants. Awesome! Others will go on to be doctors, lawyers, teachers or scientists. Some of you may go into academia and earn a PhD. A few of you may want to become econ. profs. (If so, we should talk.) No matter what you choose, econ is a great thing to study.
5 A Brief Spiel Economics Why Econ is awesome. The reason Econ is so popular is that it s powerful. Over the years, Econ has developed some very effective tools to help us to think about all sorts of human behavior. Some of these issues seem directly related to The Economy. E.g: employment, interest rates, trade, growth, banking, credit ratings, taxation, monetary policy & so on. Economics is also used to analyze many other issues. E.g: risky sex, drug use, personality traits, beliefs, prostitution, violence & advertising. The list goes on; in one of my courses, we discuss a paper that relates Brazilian soap operas to fertility.
6 X marks the spot... Today, I ll introduce Supply and Demand Analysis. It a tool in economics that is deceptively simple. This tool can shed light on a lot of interesting market dynamics.
7 Outline: Demand curves. Supply curves. Equilibrium prices and quantities. An example.
8 Demand Curves
9 Demand Curves Demand curves relate prices to quantity consumed. They capture how consumer demand responds to prices.
10 Demand Curves Key concepts. 1 Generally, lower prices lead to higher demand for goods. 2 New products or technologies can change the relationship. 3 Sometimes, higher prices lead to big shifts in demand. 4 Other times, higher prices lead to smaller demand shifts. Let s take a look...
11 Demand Curves
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27 Demand Curves
28 Supply Curves
29 Supply Curves Supply curves relate prices to quantity supplied by firms. They capture how firms respond to prices.
30 Supply Curves Key concepts. 1 Generally, higher prices lead to higher supply of goods. 2 New products or technologies can change the relationship. 3 Sometimes, higher prices lead to big shifts in supply. 4 Other times, higher prices lead to smaller supply shifts. Let s take a look...
31 Supply Curves
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37 Supply Curves
38 Supply Curves
39 Supply Curves
40 Equilibrium
41 Equilibrium Equilibrium is where demand equals supply. Here, we say: markets clear. What happens when markets don t clear?
42 Equilibrium Key concepts. 1 At some prices, supply demand. 2 Shifts in supply and demand have different effects. 3 These effects depend on the slope of the curves. Let s take a look...
43 Equilibrium
44 Equilibrium
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58 Equilibrium
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60 Equilibrium
61 Equilibrium
62 Let s use supply and demand analysis in an example.
63 The U.S. Market for Cocaine
64 An Exercise: The U.S. Market for Cocaine In the past decade or so, the price of cocaine has dropped. Why?
65 An Exercise: The U.S. Market for Cocaine What to think about. Is the demand curve steep or flat? In Economics, 1 A flatter curve means demand is elastic 2 A steeper curve means demand is inelastic Why?
66 An Exercise: The U.S. Market for Cocaine
67 An Exercise: The U.S. Market for Cocaine
68 An Exercise: The U.S. Market for Cocaine
69 An Exercise: The U.S. Market for Cocaine
70 An Exercise: The U.S. Market for Cocaine What to think about. Is the demand curve steep or flat? Is the supply curve steep or flat? What sorts of shifts could lead to lower prices? Try shifting curves on your own. Was it a demand shift? A supply shift? What are the competing stories?
71 An Exercise: The U.S. Market for Cocaine
72 An Exercise: The U.S. Market for Cocaine One additional piece of data... It turns out that use of cocaine has not gone down. Now do we know why prices declined?
73 An Exercise: The U.S. Market for Cocaine
74 An Exercise: The U.S. Market for Cocaine
75 An Exercise: The U.S. Market for Cocaine
76 An Exercise: The U.S. Market for Cocaine From the Slate: Economies of scale[...] cocaine was a small-time business, with coca leaves being processed in the basements of rickety houses in Colombian suburbs.
77 An Exercise: The U.S. Market for Cocaine From the Slate: With the surge in demand that began at the end of the 1970s, however, the kingpins built out their empires, modernizing processing, transport, and retail networks.
78 An Exercise: The U.S. Market for Cocaine From the Slate: According to figures compiled by Jonathan P. Caulkins of Carnegie Mellon University and Peter Reuter of the University of Maryland, around 33 percent of the price of cocaine went toward compensating smugglers and dealers for the risk of violence in Gun violence is way down since that time, so dealers likely aren t demanding the same risk premium.
79 An Exercise: The U.S. Market for Cocaine PS: now you can watch Narcos on Netflix and say you re doing economic research. You re welcome.
Elasticity. Definition of the Price Elasticity of Demand: Formula for Elasticity: Types of Elasticity:
Elasticity efinition of the Elasticity of emand: The law of demand states that the quantity demanded of a good will vary inversely with the price of the good during a given time period, but it does not
Elasticity. Demand is inelastic if it does not respond much to price changes, and elastic if demand changes a lot when the price changes.
Elasticity The price elasticity of demand measures the sensitivity of the quantity demanded to changes in the price. Demand is inelastic if it does not respond much to price changes, and elastic if demand
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7 AGGREGATE SUPPLY AND AGGREGATE DEMAND* Chapter. Key Concepts
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