Understanding Demand Curve Changes: Movements and Shifts

The demand curve illustrates the relationship between the price of a good and the quantity demanded, assuming all other factors remain constant (ceteris paribus). When factors other than the price of the good change, the entire demand curve can shift. When only the price of the good changes, there is a movement along the existing demand curve.

Analyzing Factors and Their Impact on Demand

Let's analyze each factor listed in List-I and determine its impact on the demand curve, matching it with the outcomes described in List-II based on the provided correct answer option.

• (A) Increase in price: This refers to a change in the price of the good itself. According to standard economic principles, a change in price causes a movement along the demand curve. An increase in price typically leads to a decrease in the quantity demanded, resulting in an upward movement along the demand curve. However, the provided option matches an increase in price with (I) "Will lead to downward movement".
• (B) Decrease in price: Like an increase in price, this is a change in the price of the good itself. According to standard economic principles, a decrease in price typically leads to an increase in the quantity demanded, resulting in a downward movement along the demand curve. However, the provided option matches a decrease in price with (II) "Will lead to upward movement".
• (C) Increase in price of substitute goods: Substitute goods are products that can be used in place of each other (e.g., tea and coffee). If the price of a substitute good increases, the good in question becomes relatively cheaper. Consumers will tend to buy more of the good in question at any given price. This represents an increase in demand, causing the entire demand curve to shift to the right. This matches with (IV) "Will lead to rightward shift in demand curve of normal goods".
• (D) Unfavourable taste & preference: Tastes and preferences are non-price factors affecting demand. If consumer preferences shift against a good, they will want to buy less of it at any given price. This represents a decrease in demand, causing the entire demand curve to shift to the left. This matches with (III) "Will lead to leftward shift in demand curve".

Summary of Matches

Based on the analysis aligning with the provided option, the matches are as follows:

• (A) Increase in price corresponds to (I) Will lead to downward movement.
• (B) Decrease in price corresponds to (II) Will lead to upward movement.
• (C) Increase in price of substitute goods corresponds to (IV) Will lead to rightward shift in demand curve of normal goods.
• (D) Unfavourable taste & preference corresponds to (III) Will lead to leftward shift in demand curve.

Revision Table: Key Demand Concepts

Additional Information: Factors Affecting Demand

Besides the good's own price, several other factors influence the demand for a good. These non-price factors cause the entire demand curve to shift. Key factors include:

• Income of Consumers: For normal goods, demand increases with income (rightward shift). For inferior goods, demand decreases with income (leftward shift).
• Prices of Related Goods:
  • Substitute Goods: As seen in the question, an increase in the price of a substitute increases demand for the original good (rightward shift).
  • Complementary Goods: These are goods used together (e.g., cars and petrol). An increase in the price of a complement decreases demand for the original good (leftward shift).
• Tastes and Preferences: As seen in the question, favourable changes increase demand (rightward shift), while unfavourable changes decrease demand (leftward shift).
• Consumer Expectations: If consumers expect the price of a good to increase in the future, they may increase their current demand (rightward shift).
• Population Size and Composition: An increase in population size generally increases market demand (rightward shift). Changes in demographics can also affect demand for specific goods.

Understanding the distinction between movement along and shift of the demand curve is fundamental in economics for analyzing market changes.