Question 1

What happens to a consumer's purchasing behavior when the price of a product changes?

Accepted Answer

When a product's price changes, it affects how much a consumer purchases, called the price effect or total effect. For example, when clothing price drops from $20 to $10 per unit, a consumer may increase purchases from seven to fifteen units weekly. This change in quantity demanded directly results from the price change and helps explain how relative price shifts influence consumption decisions.

Question 2

How does a price change affect a consumer's budget line?

Accepted Answer

When a product's price decreases, the budget line rotates outward, allowing consumers to purchase more of that good with the same income. For instance, if a student's $100 allowance buys books at $10 instead of $20 each, the budget line shifts, enabling ten book purchases instead of five. This rotation reflects the consumer's expanded purchasing power for that specific product.

Question 3

What is the difference between the substitution effect and income effect in price changes?

Accepted Answer

The substitution effect occurs when consumers buy more of a cheaper good relative to others due to changed relative prices. The income effect reflects how purchasing power changes for all goods when one price shifts. Together, these income and substitution effects explain the total change in consumption when a product's price changes.

Question 4

How do indifference curves help identify a consumer's new equilibrium after a price change?

Accepted Answer

An indifference curve shows combinations of goods that provide equal satisfaction. When price changes, the budget line rotates and touches a new indifference curve at a different point, representing the consumer's new equilibrium. This new point reveals how much of each good the consumer will purchase given the changed price and their preferences.

Question 5

Why does quantity demanded increase when a product's price falls?

Accepted Answer

When price decreases, the product becomes relatively cheaper compared to alternatives, encouraging consumers to purchase more of it. Additionally, the consumer's purchasing power increases, allowing them to afford greater quantities. Both effects—substitution toward the cheaper good and increased real income—drive the rise in quantity demanded following a price reduction.

Question 6

Can the total effect of a price change be used to derive a demand curve?

Accepted Answer

Yes, the total effect shows how quantity demanded changes at different price levels. By plotting these price-quantity relationships across multiple price points, you can construct a demand curve. This relationship between price changes and quantity demanded is fundamental to deriving the demand curve from price consumption curve analysis.

Question 7

How does the total effect of price change relate to consumer choice optimization?

Accepted Answer

The total effect demonstrates how consumers adjust their consumption bundle when prices shift, moving to a new equilibrium point that maximizes their satisfaction given the new budget constraint. This adjustment reflects rational consumer behavior, where individuals respond to price signals by reallocating purchases to optimize their utility within their available income.

Effet total d’une variation de prix

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