Demand and the Law of Demand Notes
Demand and the Law of Demand
- Definition of Demand: The amount of a good or service that consumers are willing and able to buy, reflecting the relationship between price and quantity.
- Key Conditions for Demand: Includes both the ability and the desire to purchase goods.
Understanding Demand
- Price vs. Quantity Demanded: The quantity demanded moves inversely to price.
- When price increases, quantity demanded decreases.
- When price decreases, quantity demanded increases.
Demand Schedule
- Purpose: Helps businesses set prices to maximize revenue.
- Example Schedule (Market Demand Schedule for Soda):
| Price ($) | Quantity Demanded |
|
|---|
| 0.25 | 890 |
|
| 0.50 | 500 |
|
| 0.75 | 480 |
|
| 1.00 | 470 |
|
| 1.25 | 410 |
|
| 1.50 | 350 |
|
| 1.75 | 280 |
|
| 2.00 | 240 |
|
| 2.25 | 200 |
|
| 2.50 | 150 |
|
| 2.75 | 100 | |
| | |
Demand Curve | | |
- Definition: A graphical representation of the demand schedule showing the relationship between price and quantity demanded.
- Law of Demand: Reflects that the demand curve slopes downwards, indicating that higher prices lead to lower quantities demanded.
Factors Influencing Demand
- 1. Income Effect: A change in consumer income affects how much of a good is bought.
- 2. Substitution Effect: If the price of a good rises, consumers may switch to cheaper substitutes.
- Example: If steak becomes more expensive, consumers may buy more chicken.
- 3. Diminishing Marginal Utility: Successive units of a product provide less satisfaction; hence, consumers will only buy more if prices decrease.
Demand Shift vs. Movement
- Movement Along the Curve: Caused by changes in the price of the good.
- Shift of the Demand Curve: Caused by changes in determinants of demand such as:
- Consumer preferences
- Market size
- Income levels
- Prices of related goods
- Consumer expectations
- Right Shift: Indicates an increase in demand.
- Left Shift: Indicates a decrease in demand.
Elasticity of Demand
- Definition: Measures how the quantity demanded responds to price changes.
- Types:
- Elastic Demand: A small change in price leads to a large change in quantity demanded.
- Inelastic Demand: Quantity demanded changes little when the price changes.
Summary of Key Points
- Demand is influenced by price changes, shifting determinants, and consumer behavior. Understanding these concepts is essential for analyzing market dynamics and making informed economic decisions.