When people’s actions are based on self-interest, people respond to incentives, that is, to costs and benefits. When the costs of an activity are raised or the benefits reduced, people do less of the activity. Economists have found that they can use this simple idea of action based on costs and benefits to constructs model that explains how many markets work. This model, the model of demand and supply, is perhaps the most basic of the models economists use to explain the world around us. In a competitive market price will function to equalize the quantity demanded by consumers, and the quantity supplied by producers.
Table of Contents
1. Introduction
2. Demand schedule
3. The supply schedule
4. Equilibrium
5. Elasticity
6. Shortages and Surpluses
7. History
Objectives and Topics
The primary objective of this text is to introduce the fundamental economic model of demand and supply, explaining how market prices are determined through the interaction of consumer behavior and producer output based on costs and benefits.
- The relationship between price, quantity demanded, and quantity supplied.
- The graphical representation of demand and supply curves.
- The concept of market equilibrium and price adjustment mechanisms.
- The role of elasticity in measuring sensitivity to market changes.
- The historical development of the modern supply and demand model.
Excerpt from the book
The supply schedule
The supply schedule, graphically represented by the supply curve, is the relationship between market price and amount of goods produced. The basic notion behind the supply curve is that the higher the price of a product, the more of it producers will supply. In other words supply curves are upward sloping. Though usually the relationship is positive, so that when price increases so does quantity supplied, there are exceptions. Therefore there is no law of supply that parallels the “ law of demand “. The supply curve can also be illustrated in the form of a table or a graph.
A supply curve
Price of widgets Number of widgets Sellers want to sell
$ 1.00 10
$ 2.00 40
$ 3.00 70
$ 4.00 140
The graph shown below has a positive slope, which is the slope one normally expects from a supply curve.
Summary of Chapters
Introduction: Explains the basic premise of economic action based on self-interest, incentives, costs, and benefits within a competitive market.
Demand schedule: Details the inverse relationship between price and quantity demanded, culminating in the definition of the law of demand.
The supply schedule: Describes the positive relationship between price and quantity supplied, highlighting that supply curves typically slope upward.
Equilibrium: Defines market equilibrium as the state where quantity supplied and quantity demanded are equal at a specific market clearing price.
Elasticity: Introduces the concept of sensitivity, measuring how supply and demand respond to changes in price.
Shortages and Surpluses: Analyzes the adjustment process when markets are not in equilibrium, explaining the causes of shortages and surpluses.
History: Traces the origins of the modern supply and demand model to Alfred Marshall’s 1890 publication, despite earlier usage of the terms.
Keywords
Demand, Supply, Equilibrium, Price, Market, Law of Demand, Elasticity, Shortage, Surplus, Incentives, Costs, Benefits, Economics, Alfred Marshall, Quantity
Frequently Asked Questions
What is the fundamental focus of this work?
The text focuses on the basic economic model of demand and supply, which serves as a foundation for understanding how markets function and how prices are determined.
What are the central themes discussed in the document?
The central themes include the mechanics of demand and supply schedules, the concept of market equilibrium, elasticity, and the adjustment processes that resolve market imbalances.
What is the primary goal of the author?
The primary goal is to explain the simple but powerful economic model of action based on costs and benefits, which economists use to analyze market dynamics.
Which scientific method is utilized in this study?
The study utilizes theoretical modeling combined with graphical and tabular analysis to illustrate economic relationships between price and quantity.
What topics are covered in the main body of the text?
The main body covers demand schedules, supply schedules, market equilibrium, the concept of elasticity, and the practical implications of market shortages and surpluses.
Which keywords characterize this paper?
The paper is characterized by terms such as demand, supply, market equilibrium, price elasticity, and market incentives.
Why is the "law of demand" considered a foundational concept?
It is foundational because it describes the near-universal inverse relationship where higher prices lead to lower consumer demand for a product.
How do markets adjust when they are not in equilibrium?
Markets adjust through price changes; shortages drive prices upward as buyers compete, while surpluses prompt sellers to lower prices to reach market clearing levels.
Who is credited with the formalization of the modern model?
The modern supply and demand model is attributed to Alfred Marshall, who published "Principles of Economics" in 1890.
What is the significance of the "widget" in the examples?
The widget is an imaginary product used as a tool by economists to simplify examples when no specific real-world product is necessary to explain the theory.
- Citation du texte
- Heinrich Struck (Auteur), 2008, Demand and supply, Munich, GRIN Verlag, https://www.grin.com/document/118556
