Demand - AP Macroeconomics

Based on the demand curves shown for real output (Real GDP), which macro-level determinant most likely caused the shift from $D_1$ to $D_2$ ?
Answer: An increase in consumer confidence that raised planned spending at each price level Demand refers to the entire relationship between price and quantity at all price levels, while quantity demanded is a specific amount at one price. The graph shows a rightward shift from D₁ to D₂, meaning consumers are willing to buy more at every price level. This shift indicates an increase in demand, which occurs when a non-price determinant changes favorably. Consumer confidence is a key macroeconomic determinant—when confidence rises, people feel more optimistic about their economic future and increase planned spending at each price level. A common misconception is confusing movements along a curve (caused by price changes) with shifts of the curve (caused by determinant changes). Strategy: If the entire curve moves, look for what changed besides price—here it's consumer confidence affecting spending behavior.
If a government announces that a new sales tax on automobiles will be implemented in one month, the current demand for automobiles is most likely to
Answer: increase, because consumers will want to purchase before the price effectively rises. The announcement of a future tax is an expectation of a future price increase. Consumers will react by increasing their current demand to avoid paying the higher price later. This shifts the current demand curve for automobiles to the right.
Based on the demand curve shown, the economy moves from point A to point B due to a change in price only. This is a movement along demand. Which statement is correct?
Answer: Quantity demanded increases because price falls from A to B on the same curve Demand is the entire curve showing the price-quantity relationship, while quantity demanded is the specific amount at one price. The graph shows movement from point A (higher price) to point B (lower price) along the same demand curve. According to the law of demand, when price falls, quantity demanded increases—we move down and right along the existing curve. This represents a movement along the demand curve, not a shift, because only price changed. A key misconception is thinking lower prices shift demand right; price changes never shift curves, they only cause movements along them. Strategy: If the curve stays in place and we move between points on it, price is the only thing that changed.
An increase in the price of product A results in a decrease in the demand for product B. This indicates that
Answer: products A and B are complements. Complementary goods are used together. When the price of product A increases, consumers buy less of A. Because A and B are used together, the demand for product B also falls. This defines the relationship between complements.
Suppose two events affect the market for solar panels simultaneously: the price of electricity (a substitute for solar power) rises, and a new study shows solar panels are less durable than previously believed. What is the net effect on the demand curve for solar panels?
Answer: The direction of the shift in the demand curve is indeterminate. The rise in the price of electricity, a substitute, will increase the demand for solar panels (a rightward shift). The negative durability study will decrease demand due to a change in tastes/preferences (a leftward shift). Since these two effects work in opposite directions, the net effect on demand is indeterminate without knowing the magnitude of each shift.
Which of the following would NOT cause a shift in the demand curve for avocados?
Answer: A decrease in the price of avocados due to a large harvest. A change in the price of the good itself causes a movement along the demand curve (a change in quantity demanded), not a shift of the entire curve. The other options are changes in the determinants of demand (tastes, price of related goods, income) and would therefore cause the demand curve to shift.
If a decrease in consumer income causes the demand for canned vegetables to increase, then canned vegetables are considered
Answer: an inferior good. By definition, an inferior good is a good for which demand increases when consumer income falls. This is because consumers substitute away from more expensive goods towards cheaper alternatives as their purchasing power decreases.
Suppose beef and chicken are substitute goods. A sharp decrease in the price of chicken will cause which of the following in the market for beef?
Answer: A leftward shift in the demand curve for beef. Since beef and chicken are substitutes, consumers can choose between them. When the price of chicken falls, consumers will buy more chicken and less beef at any given price of beef. This decrease in demand for beef is represented by a leftward shift of its demand curve.
A recent trend of consumers becoming more environmentally conscious and preferring reusable water bottles has gained popularity. What is the most likely impact on the market for single-use plastic water bottles?
Answer: A decrease in demand for single-use bottles. This trend represents a change in consumer tastes and preferences away from single-use plastic. This change will decrease the demand for single-use plastic water bottles at every price, causing the demand curve to shift to the left.
Consider the market for smartphones. Which of the following would result from an increase in the price of wireless data plans, a complement to smartphones?
Answer: A decrease in the demand for smartphones. Smartphones and data plans are complementary goods because they are often consumed together. If the price of a complement increases, the cost of the combined experience goes up, which leads to a decrease in the demand for the related good. This is shown as a leftward shift of the demand curve for smartphones.
Assume that airline tickets are a normal good. An increase in average consumer income will cause which of the following changes in the market for airline tickets?
Answer: A rightward shift of the demand curve. For a normal good, demand has a direct relationship with consumer income. An increase in income means consumers are willing and able to buy more of the good at every price level, which is represented by a rightward shift of the entire demand curve.
Based on the demand curve shown for an economy-wide good, the short run moves from point A to point B due to a price decrease, while the long run shows a demand shift from $D_1$ to $D_2$ due to higher consumer confidence. Which option correctly distinguishes quantity demanded from demand?
Answer: In the short run, quantity demanded increases; in the long run, demand increases Demand is the entire curve showing all price-quantity combinations, while quantity demanded is the amount at one specific price. The scenario describes two distinct changes: first, a price decrease causes movement from A to B along D₁ (quantity demanded increases in the short run). Second, higher consumer confidence shifts the entire curve from D₁ to D₂ (demand increases in the long run). This perfectly illustrates the difference—price changes cause movements along curves (affecting quantity demanded), while determinant changes shift curves (affecting demand itself). A key misconception is using these terms interchangeably when they represent fundamentally different concepts. Strategy: Movement along = quantity demanded changes due to price; shift of curve = demand changes due to determinants.
The market demand for a product is derived by which of the following procedures?
Answer: Horizontally summing the quantities demanded by all individuals at each specific price. The market demand curve is the horizontal summation of individual demand curves. This means that for each possible price, the quantities demanded by all consumers in the market are added together to find the total market quantity demanded.
The demand for vintage comic books is influenced by their rarity, the income of collectors, and the price of modern comic books. Which of the following scenarios would most likely lead to a decrease in the demand for vintage comic books?
Answer: A recession that reduces the wealth and income of collectors. A recession reduces collector income, and since vintage comic books are a normal (and likely luxury) good, a decrease in income will lead to a decrease in demand, shifting the curve left. A popular movie would increase demand. A price increase for the good itself decreases quantity demanded, not demand. An increase in the price of a substitute would increase demand for vintage comics.
The law of demand states that, ceteris paribus, which of the following relationships exists?
Answer: An inverse relationship between the price of a good and the quantity demanded of that good. The law of demand describes the inverse relationship between the price of a good and the quantity consumers are willing and able to purchase. As the price of a good rises, the quantity demanded falls, and as the price falls, the quantity demanded rises, all other things being equal.
Which of the following scenarios best illustrates the concept of a change in quantity demanded?
Answer: A pizza parlor sells fewer pizzas after the price of pizzas rises by $2. A change in quantity demanded is a movement along the demand curve caused solely by a change in the price of the product itself. The other options describe scenarios that would cause a shift in the entire demand curve due to changes in tastes, number of buyers, or expectations.
Based on the demand curve shown for an economy-wide good, the price increases from $P_1$ to $P_2$ as indicated. This change represents a movement along the demand curve. Which statement correctly describes what happens?
Answer: Quantity demanded decreases, moving from point A to point B on the same curve Demand is the entire price-quantity relationship shown by the curve, while quantity demanded is the specific amount consumers will buy at a particular price. The graph shows movement from point A to point B along the same demand curve as price rises from P₁ to P₂. When price increases, the law of demand tells us quantity demanded decreases—we move up and left along the existing curve. This is a movement along the demand curve, not a shift of the curve itself. A key misconception is thinking that price changes shift the demand curve; they don't—price changes cause movements along the existing curve. Strategy: Ask yourself what changed—if only price changed, it's a movement along; if a non-price factor changed, the curve shifts.
If bus travel is considered an inferior good, what is the likely effect of a significant decrease in average consumer income on the demand for bus travel?
Answer: The demand curve for bus travel will shift to the right. An inferior good is one for which demand increases as consumer income decreases. As consumers have less income, they substitute away from more expensive options (like cars or planes) towards cheaper alternatives like bus travel, thus shifting the demand curve for bus travel to the right.
If consumers expect the price of housing to decrease substantially in the near future, which of the following will be the most likely effect on the current housing market?
Answer: The current demand for housing will decrease, shifting the demand curve left. Consumer expectations about future prices affect current demand. If consumers believe prices will be lower in the future, they will postpone their purchases, causing current demand to decrease. This is represented by a leftward shift of the demand curve.
The demand curve for a typical good is downward-sloping primarily due to
Answer: the income and substitution effects of a price change. The downward slope of the demand curve is explained by the substitution effect (consumers switch to cheaper alternatives when price rises) and the income effect (a price increase reduces consumers' real purchasing power, leading them to buy less). The other options relate to production and supply concepts.

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