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Demand, Supply and Price Determination

112 questions

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Question 101Question →

A government policy introducing a heavy subsidy on electric vehicles leads to a widespread reduction in their retail market price. Consequently, consumer purchasing patterns alter, causing a noticeable drop in the market demand for petrol-powered cars at every price level. Which of the following correctly describes how this economic event affects the market demand curve for petrol-powered cars?

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Answer: An inward (leftward) shift of the demand curve, because electric vehicles and petrol-powered cars are substitute goods in competitive demand.

Answer

An inward (leftward) shift of the demand curve, because electric vehicles and petrol-powered cars are substitute goods in competitive demand.
Electric vehicles and petrol-powered cars are substitute goods in competitive demand. When the price of electric vehicles drops due to subsidies, consumers substitute away from petrol-powered cars. Because this change is triggered by a non-price determinant (price of a substitute good) rather than a change in the price of petrol-powered cars themselves, the market demand for petrol-powered cars decreases at every price point, causing an inward (leftward) shift of its demand curve.

Step-by-Step Solution

1
Identify the relationship between the two goods described in the scenario.
Electric vehicles and petrol-powered cars are substitute goods (competitive demand) because consumers choose between them to fulfill similar transportation needs.
Determining whether goods are substitutes or complements dictates the direction of the demand change when the price of one changes.
2
Analyze the impact of a price decrease in the substitute good on the target commodity's market.
A fall in the price of electric vehicles makes them relatively cheaper, causing consumers to switch away from petrol-powered cars, reducing overall demand for petrol-powered cars.
Cross-price elasticity for substitutes is positive: a decrease in the price of Good X leads to a decrease in demand for Good Y.
3
Distinguish between a change in quantity demanded and a change in demand.
Since the change is driven by a non-price determinant (the price of a substitute) rather than the price of petrol-powered cars itself, the effect is represented by a leftward (inward) shift of the demand curve.
Price changes of the good itself cause movements along the curve, while non-price factors cause shifts of the entire curve.

Key Concept

Impact of Substitute Good Prices on Demand Curve Shifts
Estimated Time:1m 0s
Question 102Question →

Complete the statement below by identifying the correct economic classification of demand.

Fill in the blanks below

A shoe factory increases its orders for natural rubber to produce more athletic sneakers following a surge in consumer demand for footwear. In economic analysis, the factory's demand for natural rubber is classified as demand.
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Answer

The demand for natural rubber in this scenario is classified as derived demand.
Derived demand occurs when the demand for a good or factor of production is dependent on the demand for another final good or service. Natural rubber is demanded by manufacturers to make sneakers, so its demand stems directly from consumer demand for footwear.

Step-by-Step Solution

1
Examine the relationship between the raw material (natural rubber) and the final product (athletic sneakers).
Natural rubber is an input used in the production process of footwear, rather than a final consumer good.
Understanding whether a good is consumed directly or used as a production input determines its demand classification.
2
Apply the appropriate demand type definition.
Demand for an input or factor of production that arises directly from the demand for the final commodity it produces is defined as derived demand.
The factory demands rubber only because consumers demand sneakers.

Key Concept

Derived Demand
Estimated Time:1m 0s
Question 103Question →

Evaluate the market developments below and match each change in economic conditions (Left) to its corresponding geometric effect on the demand curve for the affected commodity (Right).

Click a left item, then click its matching right item

Items

A major price hike in premium motor spirit (petrol) affecting the market for compressed natural gas (CNG) commercial buses.
A direct reduction in the market retail price of local unpolished rice on the consumer purchases of local unpolished rice itself.
A severe economic downturn causing a decline in real household disposable income on the market for low-quality cassava flour (an inferior good).
An intensive public health advisory detailing the chronic health risks of consuming refined sugar on the market for industrial refined sugar.

Matches

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Answer

The market developments match their demand curve effects as follows: Petrol price increase shifts CNG bus demand curve outward (competitive substitute); local rice price reduction causes downward movement along its demand curve (increase in quantity demanded); falling household income shifts cassava flour demand curve outward (inferior good response); health warnings shift refined sugar demand curve inward (adverse taste change).
Each market event is correctly paired by distinguishing between own-price effects (movements along the demand curve) and non-price determinants (shifts of the demand curve). The price hike of petrol increases demand for CNG buses as a substitute (rightward shift). The price drop of local rice increases quantity demanded along its current curve (downward movement). Falling incomes boost demand for cassava flour due to its inferior good property (rightward shift). Health advisories weaken preferences for sugar, shifting its demand curve leftward.

Step-by-Step Solution

1
Analyze the relationship between petrol and CNG commercial buses.
Since petrol and CNG are substitute energy sources in competitive demand, a rise in the price of petrol increases demand for CNG buses, causing an outward (rightward) shift of the demand curve.
Cross-price effects of substitute goods shift the demand curve of the alternative good.
2
Evaluate the impact of a price change on local unpolished rice itself.
A change in the commodity's own price alters quantity demanded, causing a downward movement along the existing demand curve.
Own-price changes never shift the demand curve; they alter the quantity demanded along the curve.
3
Examine the income effect on low-quality cassava flour as an inferior good.
Because cassava flour is an inferior good, lower real income causes consumers to buy more of it, shifting its demand curve outward to the right.
Inferior goods have an inverse relationship between consumer income and demand.
4
Assess the effect of public health warnings on refined sugar consumption.
Negative publicity reduces consumer preference for sugar, decreasing demand at all price levels and shifting the demand curve inward to the left.
Non-price determinants such as tastes and preferences shift the entire demand curve.

Key Concept

Distinguishing between changes in quantity demanded (own-price movements along the curve) and changes in demand (non-price factor shifts involving income, tastes, and substitute prices).
Question 104Question →

In market economics, changes in price and non-price determinants produce distinct geometric shifts or movements on a commodity's demand curve. Match each specific market event involving fresh milk on the left with its exact geometric outcome on the demand curve on the right.

Click a left item, then click its matching right item

Items

A reduction in the retail market price of fresh milk itself
A widely publicized medical report highlighting the health benefits of drinking fresh milk
A substantial price increase in fruit juice, a substitute for fresh milk
A decline in average household disposable income during a recession, where fresh milk is a normal good

Matches

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Answer

The correct pairings match: (1) price reduction of fresh milk to downward movement along the curve; (2) medical report favoring milk to an outward shift driven by tastes; (3) price increase of fruit juice to an outward shift driven by substitute cross-price elasticity; and (4) decline in consumer income to an inward shift of the demand curve.
Each economic factor correctly maps to its geometric representation: own-price changes result in movement along the curve, positive preference changes and rising substitute prices shift the curve rightward, and falling income for normal goods shifts the curve leftward.

Step-by-Step Solution

1
Distinguish between a change in price of the good itself and non-price determinants.
Recognize that a change in own-price causes movement along the curve, while non-price determinants shift the curve.
The law of demand specifies that price affects quantity demanded (movement), whereas external non-price factors alter overall demand (shift).
2
Analyze the impact of non-price determinants on tastes, substitute prices, and consumer income.
Determine the direction of shifts: positive tastes and higher substitute prices shift demand rightward; lower income for normal goods shifts demand leftward.
Substitutes have a direct cross-price relationship with demand for the target good, while normal goods share a direct relationship with consumer income.

Key Concept

Determinants and Changes in Demand (Movement along vs. Shift of Demand Curve)
Question 105Question →

Match each economic market scenario on the left with its corresponding type of demand on the right.

Click a left item, then click its matching right item

Items

Yam tubers and cassava flour purchased by households as alternative staple food sources
Fountain pens and writing ink purchased together to write letters
Timber used simultaneously for house construction, furniture making, and paper production
Processed leather purchased by a footwear manufacturing plant to produce leather boots

Matches

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Answer

Yam tubers and cassava flour match with Competitive demand; Fountain pens and writing ink match with Joint demand; Timber used for construction, furniture, and paper matches with Composite demand; Processed leather purchased by a footwear manufacturing plant matches with Derived demand.
Each economic scenario aligns strictly with the standard classification of interrelated demand: competitive demand applies to substitutes (yam and cassava flour); joint demand applies to complements (pens and ink); composite demand applies to versatile raw materials with multiple uses (timber); and derived demand applies to production inputs (leather for footwear).

Step-by-Step Solution

1
Analyze substitute goods fulfilling alternative needs
Yam tubers and cassava flour compete for household staple consumption, making their relationship competitive demand.
When two goods can easily replace each other to satisfy the same want, demand for one is competitive with the other.
2
Analyze complementary goods used together
Fountain pens require ink to function, indicating that their demand is joint (complementary).
Goods that must be combined to render utility demonstrate joint demand.
3
Analyze raw materials required for multiple distinct uses
Timber serves several separate functions (roofing, furniture, paper), demonstrating composite demand.
Demand for a commodity that caters to several alternative uses is classified as composite demand.
4
Analyze intermediate goods or factors of production
Demand for processed leather depends directly on consumer demand for finished leather boots, defining it as derived demand.
Demand for inputs or raw materials is derived from the demand for the final goods they help manufacture.

Key Concept

Types of Demand
Estimated Time:1m 30s
Question 106Question →

A sudden increase in the market price of beef causes many household consumers to switch to purchasing fish as an alternative source of protein. Which of the following best describes the resulting effect on the demand curve for fish?

Show answer & explanation

Answer: A rightward shift of the demand curve

Answer

A rightward shift of the demand curve
Beef and fish are competitive goods (substitutes). An increase in the price of beef causes consumers to seek alternative protein sources, thereby increasing the demand for fish at every price level. Because this change is driven by a non-price factor (the price of a related commodity), it causes an outward (rightward) shift of the entire demand curve for fish.

Step-by-Step Solution

1
Identify the economic relationship between beef and fish
Beef and fish serve as alternative protein sources, making them competitive demand items (substitutes).
Understanding whether goods are substitutes or complements determines the direction of the demand change.
2
Analyze the impact of a price increase in beef on the demand for fish
When the price of beef rises, consumers reduce their beef consumption and increase their demand for fish at any given price.
An increase in the price of a substitute commodity increases the demand for the alternative commodity.
3
Determine the geometric effect on the demand curve for fish
Since the change is driven by a non-price factor of fish (the price of a related good), it causes an outward (rightward) shift of the entire demand curve.
Changes in non-price determinants shift the demand curve, whereas changes in own price cause movement along the curve.

Key Concept

Impact of substitute goods' prices on demand curve shifts
Estimated Time:1m 0s
Question 107Question →

A significant fall in the price of smartphones leads to an increased market demand for protective phone cases. What type of demand is demonstrated between smartphones and protective phone cases?

Show answer & explanation

Answer: Joint demand

Answer

Joint demand
Joint demand (or complementary demand) occurs when two commodities are consumed together to satisfy a single economic want. When smartphones become cheaper, more people buy smartphones, which directly drives up the demand for protective cases.

Step-by-Step Solution

1
Analyze the relationship between the two goods
Smartphones and protective phone cases are complementary goods consumed together.
Lowering the price of smartphones increases smartphone purchases, creating a corresponding increase in demand for protective cases.
2
Classify the demand type based on economic definitions
Complementary goods exhibit joint (or complementary) demand.
Joint demand occurs when two or more commodities are needed together to satisfy a single human want.

Key Concept

Joint (Complementary) Demand
Estimated Time:1m 0s
Question 108Question →

Match each economic event affecting the market for Liquefied Petroleum Gas (LPG cooking gas) on the left to its corresponding geometric effect on the LPG demand curve on the right.

Click a left item, then click its matching right item

Items

A sharp rise in the retail price of LPG cooking gas itself
A steep increase in the market price of substitute cooking fuels (kerosene and electric cookers)
A major fall in average real household disposable income (assuming LPG is a normal good)
An announcement that LPG prices are expected to double next week

Matches

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Answer

The correct matches pair: (1) Price change of LPG itself to an upward movement along the existing demand curve; (2) Price increase of substitute fuels to an outward rightward shift driven by substitute price changes; (3) Fall in household disposable income to an inward leftward shift caused by reduced purchasing power; and (4) Expectation of future price increase to an outward rightward shift driven by consumer expectations.
Price changes of the product itself move consumers along the existing curve (contraction or expansion), while non-price determinants (substitute prices, income, and buyer expectations) shift the position of the demand curve.

Step-by-Step Solution

1
Separate price determinants from non-price determinants.
The price of LPG itself is a price determinant, causing a movement along the curve (change in quantity demanded). Substitute prices, consumer income, and expectations are non-price determinants, causing shifts of the curve (change in demand).
Changes in price alter quantity demanded along an existing curve, whereas changes in non-price factors shift the curve to a new position.
2
Determine the direction of shift for each non-price factor.
Higher substitute prices increase LPG demand (rightward shift). Reduced income decreases normal good demand (leftward shift). Expected future price rises increase current demand (rightward shift).
Each non-price determinant systematically shifts consumer willingness and ability to purchase at given price levels.

Key Concept

Distinction between movement along a demand curve (change in quantity demanded) and shifts of the demand curve (change in demand) driven by non-price determinants.
Question 109Question →

Complete the statement below regarding economic classifications of demand.

Fill in the blanks below

When a single commodity such as crude oil is required for multiple alternative uses, including the refining of petrol, diesel, and kerosene, its demand is classified as demand.
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Answer

The correct demand classification is composite demand.
Composite demand describes a situation where a single commodity has multiple different uses. Because crude oil can be processed into petrol, diesel, and kerosene, the total demand for crude oil is the aggregate of all these alternative uses.

Step-by-Step Solution

1
Analyze the usage pattern described in the scenario.
Crude oil is demanded for several distinct alternative applications (refining into petrol, diesel, and kerosene).
When a single good or resource is required to satisfy multiple alternative uses, it fits the definition of composite demand.

Key Concept

Composite Demand
Question 110Question →

Match each economic event affecting the market for palm oil on the left with its corresponding geometric effect on the palm oil demand curve on the right.

Click a left item, then click its matching right item

Items

A sharp increase in the retail price of groundnut oil (a substitute for palm oil)
A drop in the market selling price of palm oil itself
A widely published health report discouraging consumption of palm oil
A significant price hike in yam tubers (a complementary good consumed with palm oil)

Matches

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Answer

1. Price increase of groundnut oil matches Rightward shift of the demand curve caused by a price rise of a substitute. 2. Drop in palm oil selling price matches Downward movement along the demand curve indicating an increase in quantity demanded. 3. Health report discouraging consumption matches Leftward shift of the demand curve caused by an adverse change in consumer preferences. 4. Price hike in yam tubers matches Leftward shift of the demand curve caused by a price rise of a complement.
Each economic event is accurately mapped to its geometric effect. Own-price changes produce movements along the demand curve, while non-price determinants such as substitute prices, complement prices, and consumer tastes shift the demand curve in the appropriate direction.

Step-by-Step Solution

1
Distinguish between factors that cause a movement along a demand curve versus those that shift the curve.
Changes in the price of the commodity itself lead to movements along the demand curve, while changes in non-price determinants (substitutes, complements, consumer tastes, income) cause the demand curve to shift.
This fundamental distinction separates a change in quantity demanded from a change in overall demand.
2
Analyze the direction of shift or movement for each economic event.
Groundnut oil price increase increases palm oil demand (rightward shift). Palm oil price drop increases quantity demanded (downward movement). Negative health news lowers consumer preference (leftward shift). Yam price increase lowers demand for its complement palm oil (leftward shift).
Applying demand determinant principles correctly predicts the geometric outcome on the demand graph.

Key Concept

Determinants of Demand vs. Price Changes
Estimated Time:1m 30s
Question 111Question →

Following a reduction in import duties, the market price of imported wheat flour falls sharply, leading to a drop in the retail price of wheat bread. Assuming cassava bread is a close substitute for wheat bread among Nigerian households, which of the following describes the immediate geometric effect on the market demand curve for cassava bread?

Show answer & explanation

Answer: A leftward shift of the demand curve for cassava bread

Answer

A leftward shift of the demand curve for cassava bread.
Wheat bread and cassava bread serve as alternative choices to satisfy the same need, making them substitute (competitive) goods. When the price of wheat bread falls, consumers substitute away from cassava bread toward the now cheaper wheat bread. Because this change is driven by a factor other than cassava bread's own price (a non-price determinant), the entire demand curve for cassava bread shifts to the left.

Step-by-Step Solution

1
Identify the economic relationship between the two goods
Wheat bread and cassava bread are competitive goods (substitutes) since they satisfy the same basic consumer need.
Determining whether goods are substitutes or complements dictates the direction of the demand shift when the price of one good changes.
2
Analyze the impact of the price change of the substitute good
A decrease in the price of wheat bread makes it relatively cheaper, increasing the quantity demanded of wheat bread and reducing consumer demand for cassava bread.
According to the principles of competitive demand, a lower price for substitute good X decreases demand for substitute good Y.
3
Distinguish between a shift of the curve and a movement along the curve
Since the change is caused by the price of a related good (a non-price determinant for cassava bread), it causes an entire shift of the demand curve to the left, rather than a movement along the curve.
Only a change in the commodity's own price causes a movement along its demand curve (change in quantity demanded).

Key Concept

Effect of Substitute Goods' Prices on Demand Curve Shifts
Question 112Question →

A market survey analyzes consumer behavior in the Nigerian energy sector regarding solar inverter batteries. Match each economic event listed on the left with its corresponding geometric effect on the solar inverter battery demand curve on the right.

Click a left item, then click its matching right item

Items

An increase in the price of petrol used for household electricity generators
A sharp decrease in average household disposable income across urban centers
A reduction in the retail market price of solar inverter batteries
A nationwide public awareness campaign boosting consumer preference for renewable solar energy

Matches

Show answer & explanation

Answer

Each economic event matches its corresponding impact on the solar inverter battery demand curve based on non-price determinants versus own-price changes. Higher petrol prices for substitute generators cause a rightward shift in solar battery demand. Reduced disposable income causes a leftward shift for normal goods. A price drop in solar batteries themselves leads to a downward movement along the demand curve. A successful campaign promoting renewable energy shifts the demand curve to the right through consumer preference.
Non-price determinants (income, prices of substitutes, consumer tastes) cause the entire demand curve to shift left or right, whereas changes in the commodity's own price only cause a movement along the existing demand curve.

Step-by-Step Solution

1
Separate own-price changes from non-price determinants of demand
Identify that a change in the market price of solar inverter batteries causes a movement along the demand curve, whereas changes in income, substitute prices, and preferences cause the demand curve to shift.
The law of demand governs movement along the curve when own-price varies, while non-price determinants shift the entire demand curve.
2
Analyze cross-price and income effects
An increase in the price of generator fuel increases demand for substitute solar systems (rightward shift). A decline in income reduces demand for normal goods (leftward shift).
Substitute goods exhibit a positive relationship between the price of one good and the demand for the alternative good, while normal goods exhibit a direct relationship with consumer income.
3
Evaluate consumer taste and preference impact
Increased awareness and positive sentiment towards solar energy increase consumer demand at every given price (rightward shift).
A favorable change in consumer tastes increases the market demand for a product.

Key Concept

Determinants of Demand vs. Changes in Quantity Demanded
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