The demand curve is a graphical representation of the relationship between the price of a good or service and the quantity demanded by consumers over a given period. It typically slopes downwards from left to right, illustrating the law of demand, which states that, all else being equal, the quantity demanded of a good falls as the price rises, and vice versa.
Key Features of the Demand Curve
1. Downward Slope
- The demand curve slopes downward from left to right, indicating an inverse relationship between price and quantity demanded.
2. Axes
- The vertical axis (Y-axis) represents the price of the good or service.
- The horizontal axis (X-axis) represents the quantity demanded.
3. Movement Along the Curve
- Change in Quantity Demanded: A movement along the demand curve occurs when there is a change in the price of the good, leading to a change in the quantity demanded. This is called a “movement along the curve.”
- Example: If the price of a product decreases, the quantity demanded increases, resulting in a downward movement along the curve.
4. Shifts in the Demand Curve
- Change in Demand: A shift in the demand curve occurs when factors other than the price of the good change (e.g., income, preferences, prices of related goods). This results in an entire shift of the curve to the left or right.
- Increase in Demand: The demand curve shifts to the right, indicating a higher quantity demanded at each price level.
- Decrease in Demand: The demand curve shifts to the left, indicating a lower quantity demanded at each price level.
Diagaram
Demand Curve Illustration:
Example Demand Curve
| Price (₹) | Quantity Demanded (Units) |
|---|---|
| 100 | 10 |
| 80 | 20 |
| 60 | 30 |
| 40 | 40 |
| 20 | 50 |
Summary Table
| Aspect | Description |
|---|---|
| Downward Slope | Indicates inverse relationship between price and quantity |
| Axes | Y-axis: Price; X-axis: Quantity Demanded |
| Movement Along the Curve | Change in quantity demanded due to price change |
| Shifts in the Demand Curve | Change in demand due to factors other than price |
| Example of Demand Curve | Indicates an inverse relationship between price and quantity |
Factors Causing Shifts in the Demand Curve
- Income Changes: Higher income typically increases demand for normal goods.
- Consumer Preferences: Favorable changes in tastes increase demand.
- Prices of Related Goods: Higher prices of substitutes increase demand; higher prices of complements decrease demand.
- Future Price Expectations: Expected future price increases can raise current demand.
- Number of Buyers: More buyers lead to higher demand.
- Seasonal Factors: Seasonal changes can affect demand.
By understanding the demand curve, businesses can make better pricing and production decisions, and economists can analyze market behaviour more accurately.