Derivation of the Market Demand
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
Definition:
o The market demand curve shows the relationship between the total quantity
demanded of a commodity and its price, holding other factors constant.
o It is derived by horizontally summing the individual demand curves of all
consumers in the market.
Horizontal Summation:
o At each given price, the quantities demanded by individual consumers are
added to obtain the total (market) demand.
o This means for every price level,
Qm=QA+QB+QC+QD
where Qm = market demand, and QA,QB,QC,QD are individual demands.
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Illustration (Table 2.1):
o
o
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The table shows demand schedules for four consumers (A, B, C, D).
Example:
 At Price = 2, total demand = 40 + 4 + 45 + 18 = 107 units.
 At Price = 20, total demand = 3 + 0 + 0 + 0 = 3 units.
o The total market demand decreases as price increases, showing the law of
demand.
Individual Differences:
o Even if one consumer (e.g., Consumer B) considers the commodity a Giffen
good (demand rises with price), the overall market demand still slopes
downward.
o This happens because the negative slope of other consumers’ demand curves
outweighs the Giffen effect.
Shape of Market Demand Curve:
o Economic theory does not specify a fixed shape for the demand curve.
o It can take different forms:
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Linear Demand Curve:
Q=b0−b1P
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Constant slope (straight line).
Elasticity changes at different prices.
Graphical Representation:
o The individual demand curves of A, B, C, and D are combined horizontally in
Figure 2.30 to form the market demand curve.
o The resulting market demand typically slopes downward from left to right,
reflecting an inverse relationship between price and quantity demanded.
Network Externalities
1. Meaning of Network Externalities
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
Definition:
Network externalities refer to situations where an individual’s utility (satisfaction) from
consuming a good depends on the number of other people who consume or use that
same good.
Key Idea:
o The usefulness or desirability of certain goods increases or decreases depending
on how many others also use them.
o

Thus, individual demands are interdependent rather than independent.
Contrast with Independent Demand:
o In traditional demand theory, it is assumed that each individual’s demand depends
only on their own income, tastes, and prices, not on others’ consumption.
o Example: Amit’s demand for Pepsi depends on his taste and income, not on
Swati’s or Amitabh Bachchan’s demand.
o Under this assumption, market demand can be derived by simply adding
(horizontally summing) individual demands.
o However, when individuals’ demands are interconnected, simple summation no
longer accurately represents market demand — network effects must be
considered.
2. Types of Network Externalities
Network externalities can be positive or negative depending on how others’ consumption affects
one’s own satisfaction.
A. Positive Network Externalities
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1.
2.
3.
Definition:
When an increase in the number of users raises the utility or value of the good for each
consumer.
Explanation:
o The good becomes more valuable as more people use it, leading to higher
demand.
o This creates a bandwagon effect — individuals want to use what others are
using.
Examples:
Communication Goods:
 Telephones, mobile phones, fax machines, internet connections,
modems, email services.
 The usefulness of a telephone or internet connection depends on how
many others have it.
 If no one else owns a phone, having one is useless.
 As more people own telephones, each user benefits more —
communication becomes easier and more valuable.
Fashion Goods (Social Influence):
 Example: Wearing jeans among college girls in metropolitan cities.
 As more girls wear jeans, it becomes a fashion trend; others want to
follow to stay “in style.”
 This social acceptance increases demand for jeans.
Complementary Goods:


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Example: CD players and CDs.
The demand for CD discs increases as more people own CD players.
Similarly, the demand for CD players grows when more CD discs are
available.
This mutual dependence enhances the market for both — a form of
positive feedback loop.
Result:
o The market experiences increasing returns to adoption — the more people who
use a product, the greater its value to all.
B. Negative Network Externalities
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

Definition:
When an increase in the number of users reduces the utility or value of the good for
existing consumers.
Explanation:
o This happens when the good becomes less desirable or less exclusive as more
people adopt it.
o The effect can lead to a snob effect — people want to consume something that
others do not have.
Example (Fashion Reversal):
o Continuing the jeans example, while it is desirable when some wear it, if too
many people adopt the trend, it loses its uniqueness and may go “out of style.”
o Thus, excessive popularity can reduce the demand for the same good.
3. Interdependence in Complementary Goods
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
Mutual Dependence:
o Certain goods derive value only when their complementary goods are widely
available.
o Example: CD players and CD discs.
 Demand for CD players depends on the availability of CD discs.
 Demand for CD discs depends on the number of CD players in use.
o This creates a cycle of mutual reinforcement — as one market expands, so does
the other.
Economic Implication:
o Entrepreneurs and producers consider network size before entering a market.
o A small base of users can make it unprofitable to produce or sell such goods.
4. Importance and Implications
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Market Strategy:
o Firms often aim to increase the number of users early (through discounts or free
trials) to build network value.
Public Policy:
o Governments may promote network goods (like internet or mobile infrastructure)
to achieve positive spillovers in society.
Demand Curve Impact:
o Positive network effects can make the demand curve steeper or shift it
rightward as adoption spreads.
o Negative effects can cause demand to decline once saturation or overuse sets in.
Bandwagon Effect
1. Introduction
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The bandwagon effect is a phenomenon where individuals’ demand for a good increases
because others are buying it.
It reflects a positive network externality — the value or utility of a good rises as more
people use or own it.
People buy certain goods not only for their intrinsic value, but also to fit in, appear
fashionable, or maintain social status.
The term originates from “jumping on the bandwagon,” meaning joining what others
are doing.
2. Relationship with Network Externalities
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Network externalities occur when the utility a consumer derives from a product depends
on how many others use it.
The bandwagon effect is a specific case of positive network externality.
The more people buy or adopt the good, the more attractive it becomes to others.
Common in goods linked to fashion, technology, and communication.
3. Causes and Marketing Significance
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
Social Influence:
o People want to belong to groups and follow current trends.
o Products become symbols of social acceptance, prestige, or modernity.
Marketing and Advertising:
o Companies use the bandwagon effect to influence consumer behavior.
o
o
Advertisements emphasize popularity and trendiness (e.g., “Everyone’s using
it!”, “Join millions of users!”).
Such campaigns trigger social conformity and expand the market base.
4. Graphical and Conceptual Explanation

The demand curve incorporating the bandwagon effect is derived by considering how
people’s perception of others’ purchases influences their own demand.

Step-by-Step Illustration:
1. Initial Situation (D₁₀):
o Consumers believe that 10,000 people have purchased the good.
o The good has limited social appeal.
o Only consumers valuing it for intrinsic benefits buy it → Demand curve = D₁₀.
2. Increased Popularity (D₂₀):
o If 20,000 people are believed to have purchased it, the good becomes more
fashionable.
o More consumers buy it to stay in style → Demand shifts rightward to D₂₀.
3. Further Increase (D₃₀):
o When 30,000 people are known to have purchased it, attractiveness rises further.
o The demand curve shifts further right to D₃₀.
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Conclusion:
o The greater the number of buyers, the more rightward the demand curve shifts.
o This rightward shifting of demand due to popularity is the bandwagon effect.
5. Numerical Illustration
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Suppose the price of a product = ₹50 per unit.
o Without bandwagon effect → Quantity demanded = 25,000 units (from D₂₀).
o With bandwagon effect → Quantity demanded increases to 40,000 units.
Increase of 15,000 units is due to social influence, not price change.
Hence, total observed demand = price effect + bandwagon effect.
6. Effect on Elasticity
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The bandwagon effect makes the demand curve more elastic.
o Consumers react more strongly to price changes when popularity also rises.
o The combined demand curve (labeled Dᴹ) is flatter (more elastic) than D₁₀, D₂₀,
or D₃₀.
This means:
o A small price fall results in a large increase in demand when social influence
operates.
7. Economic and Social Implications
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Positive Feedback Loop:
o As more people adopt the product, its perceived value increases → further boosts
demand.
Market Expansion:
o Explains rapid growth of goods like mobile phones, fashion brands, and social
media platforms.
Marketing Strategy:
o Firms highlight large user bases or trendiness to attract new buyers.
Policy Implications:
o Understanding social consumption helps in designing public campaigns (e.g.,
promoting digital payments or eco-friendly products).
Limitation:
o If too many people adopt the product, it may lose exclusivity or appeal → giving
rise to the snob effect (a negative network externality).
8. Summary Table
Aspect
Description
Example
Type
Positive Network Externality
—
Meaning
Demand increases because others are buying
—
Key Feature
Desire to be “in style” or part of a group
Jeans, smartphones
Effect on Demand
Curve
Shifts rightward and becomes more elastic
D₁₀ → D₂₀ → D₃₀ → Dᴹ
Marketing Use
Advertising appeals to popularity
“Most people prefer this
brand”
Opposite Effect
Snob effect – demand falls when too many own
Luxury goods losing exclusivity
it
9. Conclusion
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The bandwagon effect captures the social nature of demand, showing that people’s
buying decisions are influenced by others’ behavior.
It strengthens demand and increases elasticity, leading to larger market sizes for popular
goods.
In modern markets driven by trends, social media, and peer influence, the bandwagon
effect remains a powerful force shaping consumer demand and business strategies.
nob Effect
1. Introduction
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The snob effect arises from negative network externalities.
It describes a situation where an individual’s demand for a good decreases as more
people own or consume it.
In contrast to the bandwagon effect, where popularity increases demand, the snob effect
is driven by the desire for exclusivity and distinction.
Consumers derive satisfaction from possessing goods that few others have, which
symbolize status, prestige, and uniqueness.
2. Meaning and Nature
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The snob effect refers to the desire to own a unique or rare commodity that confers
social prestige because it is not widely possessed.
The fewer the number of people owning the good, the greater the utility or satisfaction
derived from it.
As the number of owners increases, the prestige value declines, and so does the demand.
3. Examples of Snob Goods
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Rare works of art (e.g., original paintings by famous artists)
Custom-designed luxury cars (e.g., Rolls Royce, Ferrari Special Editions)
Tailor-made designer clothing and exclusive fashion items
Luxury watches and jewelry (e.g., Rolex, Cartier limited editions)
Private jets, yachts, or mansions with unique design and exclusivity
Example:
The utility from owning a luxury car at ₹35 lakhs may come primarily from the prestige and
status it conveys.
If many people start owning the same model, its exclusive value declines, reducing demand.
4. Graphical Explanation

The snob effect is illustrated through a series of demand curves shifting leftward as the
good becomes more common.
Step-by-Step Illustration:
1. Initial Demand (D₁):
o
o
o
Consumers believe that 1,000 people own the commodity.
High exclusivity → High prestige → Strong demand.
Demand curve = D₁.
2. Ownership Increases (D₂):
o If people believe 20,000 individuals own it, its snob value declines.
o The demand curve shifts leftward to D₂ as fewer people now desire it.
3. Further Increase (D₃, D₄):
o As ownership rises to 30,000 or 40,000, the good loses more prestige.
o Demand shifts further left to D₃ and D₄.
4. Market Demand Curve (Dᴹ):
o By joining points A, B, C, and E (representing quantities demanded under
different ownership perceptions), we get the overall market demand curve Dᴹ,
which incorporates the snob effect.
5. Relationship Between Price and Quantity Demanded
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The snob effect weakens the normal response of demand to price changes.
Example:
o When price = ₹35 lakhs, quantity demanded = 10,000 cars.
o When price falls to ₹15 lakhs, expected demand (without snob effect) = 50,000
cars (movement along D₁).
o But with the snob effect, demand only increases to 30,000 cars.
o The snob effect thus reduces the magnitude of demand response.
6. Effect on Elasticity
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The snob effect makes demand less elastic (inelastic).
o Consumers are less responsive to price changes because prestige value matters
more than cost.
o A fall in price may even reduce desirability, as the good appears less exclusive.
Therefore, in markets for luxury or status goods, price reductions do not proportionally
increase demand.
7. Comparison with Bandwagon Effect
Aspect
Type of Network
Bandwagon Effect
Positive
Snob Effect
Negative
Aspect
Bandwagon Effect
Snob Effect
Externality
Consumer Motivation
Desire to conform, follow trends
Desire for uniqueness, exclusivity
Effect on Demand
Demand increases as more people
buy
Demand decreases as more people
buy
Demand Curve Movement Shifts rightward with popularity
Shifts leftward with popularity
Elasticity
More elastic
Less elastic
Examples
Jeans, smartphones, social media
apps
Luxury cars, rare art, designer goods
8. Economic and Marketing Implications
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Luxury Market Strategy:
o Firms producing snob goods focus on scarcity and exclusivity to maintain
prestige.
o They often limit supply or raise prices deliberately to sustain snob appeal.
Consumer Psychology:
o Buyers associate high price with high status.
o Widespread ownership diminishes satisfaction derived from uniqueness.
Market Behavior:
o Demand for such goods may not rise even with lower prices.
o Companies use limited editions, exclusive branding, and celebrity
endorsements to reinforce snob value.
9. Summary
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The snob effect demonstrates how social and psychological factors influence consumer
demand.
It operates opposite to the bandwagon effect, emphasizing exclusivity rather than
conformity.
Demand for snob goods falls as ownership increases because their prestige value
declines.
Consequently, these goods show less elastic demand curves, and producers maintain
their market through high prices and exclusivity.
Veblen Effect and Veblen Goods
1. Introduction
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The Veblen Effect is a phenomenon in economics where demand for a good increases
as its price increases, contrary to the standard law of demand.
It was first introduced by Thorstein Veblen in his 1899 book “The Theory of the Leisure
Class.”
Veblen proposed that some consumers purchase goods not for their functional utility,
but to display wealth, prestige, and social status.
Such goods are called Veblen goods, and their demand curve is upward sloping.
2. Definition of Veblen Goods
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A Veblen good is a type of luxury good for which demand increases when price
increases.
These goods are status symbols—their appeal lies in exclusivity, prestige, and social
recognition.
When prices rise, consumers perceive the product as more desirable and high-status;
when prices fall, its snob appeal diminishes.
3. Key Features of Veblen Goods
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Upward-sloping demand curve:
o Quantity demanded increases with price.
Exclusivity:
o Owned by few; rarity adds to appeal.
High price as an attraction:
o The high price itself signals quality and wealth.
Status symbol:
o Ownership reflects social and economic standing.
Prestige and identity consumption:
o Consumers derive satisfaction from others recognizing their wealth.
4. Common Examples
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Luxury cars: Rolls-Royce, Ferrari, Lamborghini.
Designer fashion: Gucci, Louis Vuitton, Prada, Chanel.
Fine jewelry and watches: Rolex, Cartier, Tiffany & Co.
Luxury beverages: Fine wines, premium champagne.
Exclusive experiences: Private jets, elite memberships, luxury vacations.
High-end sneakers: Limited-edition collections from Nike or Adidas.
5. Relationship Between Price and Demand
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Normal Goods:
o Follow the Law of Demand — price ↑ → demand ↓.
Veblen Goods:
o Defy the Law of Demand — price ↑ → demand ↑.
Consumers interpret high prices as a sign of exclusivity and social value rather than as a
deterrent.
When prices fall, the prestige of ownership decreases, and demand may drop among
wealthy buyers.
6. Veblen Good vs. Law of Demand
Aspect
Normal Goods
Price-Demand Relationship Inverse
Veblen Goods
Direct
Demand Curve
Downward sloping Upward sloping
Reason for Purchase
Utility, affordability Status, prestige
Effect of Price Increase
Demand decreases Demand increases
Consumer Perception
Price as cost
Market Segment
Middle/Low income High-income, status-conscious buyers
Price as value signal
7. Veblen Effect vs. Giffen Goods
Basis
Veblen Goods
Giffen Goods
Basis
Veblen Goods
Giffen Goods
Type of Good
Luxury
Inferior necessity
Income Group
High-income
Low-income
Reason for Demand Increase Prestige, snob appeal
Income effect (can’t afford substitutes)
Examples
Luxury cars, designer bags
Rice, bread, potatoes
Economic Motivation
Social/psychological
Economic necessity
Demand Curve
Upward sloping (prestige effect) Upward sloping (income effect)
8. Snob Effect and Its Link to Veblen Goods
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Snob Effect:
o Refers to consumers’ desire to own rare or exclusive goods not commonly
possessed by others.
o Consumers derive satisfaction from uniqueness and rarity.
Connection to Veblen Goods:
o The snob effect drives the abnormal demand for Veblen goods.
o As prices rise, goods become less accessible, increasing snob appeal.
o When prices fall, snob appeal diminishes, making goods less desirable to the
elite.
Graphical Interpretation:
o Below price P₁, goods behave like normal goods (downward-sloping demand).
o Above P₁, snob value dominates — demand curve turns upward, showing the
Veblen effect.
Example:
o Normal cars follow typical demand; luxury brands (Ferrari, Rolls-Royce) see
demand rise with higher prices because exclusivity increases.
9. Conspicuous Consumption
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Concept:
o Introduced by Thorstein Veblen — refers to spending on luxury goods to
publicly display wealth and status.
Motivation:
o Not just utility, but recognition, admiration, and distinction.
Sociological Perspective:
o

Initially applied to the upper leisure class, but now observed in middle and even
lower classes with rising living standards.
o Example: middle-class individuals buying designer accessories or high-end
gadgets to appear affluent.
Relation to Veblen Goods:
o Conspicuous consumption explains why higher prices attract more demand—
the price itself signals social rank.
10. Demand Curve for Veblen Goods
Shape and Behavior:
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
Upward-sloping portion:
o Demand increases with price due to snob appeal and prestige.
Possible two-stage curve:
o At lower prices → behaves like normal good (downward-sloping).
o Beyond a threshold price → upward-sloping as Veblen effect dominates.
Axes Explanation:
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X-axis: Quantity demanded.
Y-axis: Price of the good.
As price moves above P₁, consumers associate high prices with exclusivity → demand
rises.
11. Elasticity and Market Impact
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Elasticity Behavior:
o Demand for Veblen goods tends to be price inelastic at lower ranges, but
positively elastic at high price levels.
Market Dynamics:
o Price increase → stronger desire among elites.
o Firms may raise prices intentionally to enhance brand image.
Luxury brand strategy:
o Artificial scarcity, limited editions, and premium pricing reinforce prestige and
stimulate demand.
12. Modern Trends and Broader Application
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The Veblen Effect extends beyond physical goods to services and experiences (e.g.,
private islands, exclusive clubs).
With globalization and social media, status signaling through brands has become even
more widespread.
Even middle and lower classes engage in aspirational consumption — purchasing
luxury-branded items to project higher status.
13. Conclusion
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The Veblen Effect shows that consumer behavior is not purely rational; social and
psychological factors often dominate.
For certain luxury goods, higher prices enhance desirability, not deter it.
It defies the law of demand, emphasizing prestige and exclusivity over affordability.
The effect explains why luxury markets thrive on high pricing strategies — price itself
becomes a signal of quality, rarity, and success.
Understanding this helps firms craft effective luxury marketing strategies and
economists analyze non-ordinary demand behaviors.
Essence:
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Veblen Goods: Luxury goods whose demand rises with price.
Driven by: Snob appeal, exclusivity, conspicuous consumption.
Economic insight: Price acts not just as cost but as a symbol of social distinction.