High School Economics Quiz: Reading Economic Graphs
20 questions · exam conditions
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Reading Economic GraphsQuestion 1 of 20

On a graph of a firm's short-run cost curves, the marginal cost (MC) curve is rising and has just crossed above the average total cost (ATC) curve. Which statement accurately describes the ATC curve at this point?

The ATC curve is at its minimum and is momentarily horizontal.
The ATC curve is now upward sloping, being pulled up by the higher marginal cost.
The ATC curve is still downward sloping but is approaching its minimum point.
The ATC curve is now approaching the average variable cost (AVC) curve from above.
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High School Economics Quiz

High School Economics Quiz: Reading Economic Graphs

Practice Reading Economic Graphs in High School Economics with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Reading Economic Graphs, giving you a quick way to practice the rules, question types, and explanations that matter most for High School Economics.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

On a graph of a firm's short-run cost curves, the marginal cost (MC) curve is rising and has just crossed above the average total cost (ATC) curve. Which statement accurately describes the ATC curve at this point?

  1. The ATC curve is at its minimum and is momentarily horizontal.
  2. The ATC curve is now upward sloping, being pulled up by the higher marginal cost. (correct answer)
  3. The ATC curve is still downward sloping but is approaching its minimum point.
  4. The ATC curve is now approaching the average variable cost (AVC) curve from above.
Explanation: The relationship between marginal and average costs is mathematical. When the marginal cost of the next unit is greater than the average total cost of all previous units, the average must increase. Therefore, at all points where the MC curve is above the ATC curve, the ATC curve must be upward sloping.

Question 2

Consider the short-run Phillips Curve (SRPC), which plots the inflation rate against the unemployment rate. If the central bank pursues an unexpected expansionary monetary policy, what is the graphical result?

  1. The entire SRPC shifts to the left.
  2. The economy moves to a point higher up and to the left along the existing SRPC. (correct answer)
  3. The entire SRPC shifts to the right.
  4. The economy moves to a point lower down and to the right along the existing SRPC.
Explanation: Expansionary monetary policy increases aggregate demand. In the short run, this leads to a higher inflation rate and a lower unemployment rate. This is represented as a movement along the stable, downward-sloping SRPC to a point with higher inflation and lower unemployment. A shift in the curve itself would be caused by a change in inflationary expectations or a supply shock.

Question 3

In the market for new gasoline-powered cars, two events occur simultaneously: the price of gasoline rises significantly, and a new manufacturing technology reduces the cost of producing cars. On a standard supply-demand graph, what is the definitive effect on the equilibrium price and quantity of cars?

  1. The equilibrium price will fall, but the effect on equilibrium quantity is indeterminate. (correct answer)
  2. The equilibrium quantity will fall, but the effect on equilibrium price is indeterminate.
  3. The equilibrium price will fall, and the equilibrium quantity will rise.
  4. The equilibrium price will rise, but the effect on equilibrium quantity is indeterminate.
Explanation: A rise in the price of gasoline (a complement) will decrease the demand for cars, shifting the demand curve to the left. The reduced manufacturing cost will increase the supply of cars, shifting the supply curve to the right. Both shifts put downward pressure on the price, so the equilibrium price will definitively fall. However, the shifts have opposing effects on quantity (leftward demand shift decreases Q, rightward supply shift increases Q), so the net effect on equilibrium quantity is indeterminate without knowing the magnitude of the shifts.

Question 4

A point is plotted on a coordinate plane with consumption goods on the x-axis and capital goods on the y-axis. If this point lies inside a country's Production Possibilities Frontier (PPF), a movement from this point to any point on the PPF would represent which of the following?

  1. A decrease in the opportunity cost of producing consumption goods.
  2. An improvement in technology that shifts the entire PPF outward.
  3. An increase in total production of both goods with zero opportunity cost. (correct answer)
  4. A trade-off requiring a decrease in the production of one good to increase the other.
Explanation: A point inside the PPF represents an inefficient allocation of resources, such as unemployment or underutilization of capital. Moving from this inefficient point to a point on the frontier means putting idle resources to work. This allows the country to increase its production of one or both goods without having to sacrifice output of the other. Therefore, this movement has zero opportunity cost.

Question 5

On a graph depicting a firm's long-run average cost (LRAC) curve and several short-run average total cost (SRATC) curves, the LRAC curve is tangent to the downward-sloping portion of a specific SRATC curve (SRATC1SRATC_1). This point of tangency represents...

  1. the most efficient level of production for the firm in the long run.
  2. the profit-maximizing output level for a firm operating with the plant size of SRATC_1.
  3. the lowest-cost way to produce that specific level of output, which is not the minimum of SRATC_1. (correct answer)
  4. a point of diseconomies of scale, where increasing plant size leads to higher average costs.
Explanation: The LRAC curve is an 'envelope' of the SRATC curves, showing the lowest possible average cost for producing any given level of output. When the LRAC is downward sloping (experiencing economies of scale), it will be tangent to the SRATC curves to the left of their minimum points. This tangency point shows the cheapest way to produce that output level, but the firm could achieve a lower average cost by building a larger plant and producing more (i.e., moving further down the LRAC).

Question 6

A severe frost damages Florida's orange crop. On a standard supply and demand graph for orange juice, with price on the vertical axis and quantity on the horizontal axis, this event causes a leftward shift of the supply curve. What is the immediate, direct consequence of this shift on the demand curve for orange juice?

  1. The demand curve shifts to the left because the product is now more expensive.
  2. The demand curve shifts to the right as consumers seek out the limited supply.
  3. The demand curve does not shift, but there is an upward movement along it. (correct answer)
  4. The demand curve becomes steeper, reflecting a decrease in the elasticity of demand.
Explanation: The frost is a non-price determinant of supply, causing the supply curve to shift left. This leads to a higher equilibrium price. The increase in price causes a decrease in the quantity demanded, which is represented as an upward movement along the existing, unchanged demand curve. The event itself does not change the underlying consumer preferences, income, or prices of related goods that would be required to shift the demand curve.

Question 7

On a graph for a single-price monopoly, the firm identifies the profit-maximizing quantity where the marginal cost (MC) and marginal revenue (MR) curves intersect. How is the price the firm will charge determined on this graph?

  1. By extending a vertical line up from the profit-maximizing quantity to the market demand curve. (correct answer)
  2. By finding the price where the marginal cost (MC) curve intersects the market demand curve.
  3. By finding the price on the average total cost (ATC) curve that corresponds to the profit-maximizing quantity.
  4. By setting the price equal to the marginal revenue at the profit-maximizing quantity.
Explanation: A monopoly's pricing power is constrained by the market demand curve. After determining the profit-maximizing quantity (where MR = MC), the firm charges the highest price consumers are willing to pay for that quantity. Graphically, this is found by taking the quantity from the MR-MC intersection and moving vertically up to the demand curve to find the corresponding price on the vertical axis.

Question 8

An analyst suggests that a country's current income tax rate places it on the right-hand, downward-sloping portion of its Laffer Curve. If this analysis is correct, what does a movement to the left along the curve graphically represent?

  1. A decrease in the tax rate that leads to a decrease in tax revenue.
  2. An increase in the tax rate that leads to an increase in tax revenue.
  3. A decrease in the tax rate that leads to an increase in tax revenue. (correct answer)
  4. A movement towards the revenue-maximizing tax rate, which also maximizes economic output.
Explanation: The Laffer Curve shows the relationship between tax rates (horizontal axis) and tax revenue (vertical axis). The right-hand, downward-sloping portion represents a region where tax rates are so high that they discourage economic activity, reducing the tax base. A movement to the left along the curve means decreasing the tax rate. In this region, such a decrease would expand economic activity enough to cause total tax revenue to rise.

Question 9

The government imposes a per-unit excise tax on the producers of a good. On a standard supply-demand graph, this action is represented by a vertical upward shift of the supply curve equal to the amount of the tax. The resulting decrease in producer surplus is graphically represented by...

  1. the area of the rectangle corresponding to the government's tax revenue.
  2. the portion of the original producer surplus that is transferred to consumers due to the price change.
  3. the triangular area known as deadweight loss, which represents value lost to both producers and consumers.
  4. a trapezoidal area bounded by the old price, the new net price received by producers, and the new supply curve. (correct answer)
Explanation: Producer surplus is the area above the supply curve and below the price received by producers. Before the tax, this is the area below the equilibrium price P_eq and above the original supply curve. After the tax, producers receive a lower net price P_net, and the quantity is lower. The new producer surplus is the area below P_net and above the original supply curve. The loss in surplus is the difference between these two areas, which is a trapezoid.

Question 10

In the foreign exchange market for British pounds (£), with the exchange rate ($ per £) on the vertical axis, an increase in real interest rates in the United Kingdom relative to the United States occurs. How would this be represented on the graph for the British pound?

  1. A leftward shift of the supply curve and a rightward shift of the demand curve for pounds. (correct answer)
  2. A rightward shift of the demand curve for pounds, causing the pound to appreciate.
  3. A rightward shift of the supply curve for pounds, causing the pound to depreciate.
  4. A movement upward along the existing demand curve for pounds.
Explanation: Higher real interest rates in the U.K. make British financial assets more attractive. U.S. investors will demand more pounds to buy these assets, shifting the demand curve for pounds to the right. Simultaneously, British investors will keep more of their money in the U.K. rather than investing it in the U.S., which decreases the supply of pounds to the foreign exchange market, shifting the supply curve to the left. Both effects cause the pound to appreciate (the price, $ per £, rises).

Question 11

A technological breakthrough greatly increases the productivity of labor in the manufacturing of robots but does not affect agricultural production. How would this event alter a country's Production Possibilities Frontier (PPF) drawn with robots on the vertical axis and food on the horizontal axis?

  1. The entire PPF shifts outward in a parallel manner, increasing maximum output of both goods.
  2. The horizontal intercept of the PPF shifts to the right, but the vertical intercept is unchanged.
  3. The vertical intercept of the PPF shifts upward, but the horizontal intercept is unchanged. (correct answer)
  4. The economy moves from a point inside the PPF to a new, higher point on the existing PPF.
Explanation: The technological breakthrough is specific to robot manufacturing. This means the maximum number of robots the country can produce (the vertical intercept) increases. Since there is no change in agricultural productivity, the maximum amount of food it can produce (the horizontal intercept) remains the same. This results in an asymmetric, outward pivot of the PPF along the vertical axis.

Question 12

In the Aggregate Demand-Aggregate Supply (AD-AS) model, with the price level on the vertical axis and Real GDP on the horizontal axis, assume the economy is in long-run equilibrium. If the government significantly cuts taxes without changing its spending, what are the short-run and subsequent long-run adjustments represented on the graph?

  1. AD shifts right, causing a movement along the SRAS; then SRAS shifts left as nominal wages rise. (correct answer)
  2. AD shifts right, causing a movement along the SRAS; then LRAS shifts right due to increased investment.
  3. SRAS shifts right due to lower business costs; then AD shifts right as incomes rise.
  4. AD shifts left due to concerns about government debt; then SRAS shifts right as wages fall.
Explanation: The tax cut increases disposable income, shifting the AD curve to the right. In the short run, the economy moves up along the existing Short-Run Aggregate Supply (SRAS) curve to a higher price level and higher output. In the long run, the higher price level leads to demands for higher nominal wages, which shifts the SRAS curve to the left, returning the economy to its long-run potential output (on the LRAS curve) but at a permanently higher price level.

Question 13

A Lorenz curve plots the cumulative percentage of households on the horizontal axis against the cumulative percentage of income on the vertical axis. If a country implements a highly progressive tax system and increases transfer payments to the poor, how would the area between the line of perfect equality and the Lorenz curve be affected?

  1. The area would increase, reflecting a higher Gini coefficient.
  2. The area would decrease, as the Lorenz curve moves closer to the line of perfect equality. (correct answer)
  3. The area would remain unchanged, as the curve's endpoints (0,0) and (100,100) are fixed.
  4. The area would be eliminated, as the Lorenz curve would become identical to the line of perfect equality.
Explanation: Progressive taxes and transfer payments are policies designed to reduce income inequality. On the graph, this is represented by the Lorenz curve shifting upward and closer to the 45-degree line of perfect equality. The area between these two curves is a measure of inequality (it forms the numerator of the Gini coefficient). Therefore, a successful redistributive policy will decrease this area.

Question 14

The production of fertilizer creates nitrogen runoff, a negative externality that harms local fisheries. On a supply and demand graph for fertilizer, where the supply curve represents the industry's private marginal costs, how is the deadweight loss from this externality represented?

  1. The area between the private supply curve and a higher social marginal cost curve, from quantity zero to the market equilibrium quantity.
  2. A rectangular area representing the total external cost, calculated by multiplying the per-unit external cost by the market quantity.
  3. The area of consumer surplus that is lost when the government imposes a tax to correct the externality.
  4. A triangular area between the market equilibrium quantity and the socially optimal quantity, bounded by the demand and social marginal cost curves. (correct answer)
Explanation: The social marginal cost (SMC) curve is higher than the private supply curve. The market produces where private supply equals demand, resulting in quantity Q_market. The socially optimal quantity, Q_optimal, is where SMC equals demand. The market overproduces the good (Q_market > Q_optimal). The deadweight loss is the loss of total surplus for the units produced between Q_optimal and Q_market, represented graphically by the triangular area between the demand curve and the SMC curve for this range of output.

Question 15

Forecasters announce that a major hurricane is expected to hit the Gulf Coast next week, which will disrupt oil production. On a supply and demand graph for gasoline in the affected region this week, how would this forecast be represented?

  1. The supply curve shifts left immediately as producers hold back inventory.
  2. The demand curve shifts right as consumers buy now to avoid future shortages and price hikes.
  3. No change occurs on the graph until the hurricane actually makes landfall.
  4. Both the supply curve shifts left and the demand curve shifts right. (correct answer)
Explanation: Expectations of future events affect current behavior. Consumers, expecting future shortages and higher prices, will increase their demand now, shifting the current demand curve to the right (e.g., filling up their gas tanks). At the same time, some suppliers may withhold some of their current inventory from the market, hoping to sell it at a higher price after the disruption, which would shift the current supply curve to the left. The combined effect is a definite increase in the current price.

Question 16

Two linear demand curves are shown on the same price-quantity graph. At any given price, the percentage change in quantity demanded is much larger for curve A than for curve B. How would these two curves be depicted?

  1. Curve A would be significantly steeper than curve B.
  2. Curve B would be significantly steeper than curve A. (correct answer)
  3. Curve A would be upward-sloping while curve B would be downward-sloping.
  4. Curve B would be positioned to the right of curve A at all price levels.
Explanation: A larger percentage change in quantity for a given change in price indicates a higher price elasticity of demand. On a graph, demand curves that are more elastic are flatter, while demand curves that are more inelastic are steeper. Since curve A is more responsive (more elastic), it would be flatter. Curve B, being less responsive (more inelastic), would be steeper.

Question 17

A country's Production Possibilities Frontier (PPF) for capital goods (vertical axis) and consumer goods (horizontal axis) is bowed outwards. What does a movement from a point on the curve near the vertical axis to a point on the curve near the horizontal axis graphically represent?

  1. An increase in economic efficiency as the nation specializes in consumer goods.
  2. A reallocation of productive resources where the opportunity cost of consumer goods is increasing. (correct answer)
  3. Economic growth that disproportionately favors the production of consumer goods.
  4. A change in production from an inefficient point to an efficient point on the frontier.
Explanation: A movement along the PPF represents a reallocation of resources. Because the curve is bowed outwards, it exhibits increasing opportunity cost. Moving from the upper-left (high capital goods) to the lower-right (high consumer goods) means producing more consumer goods. As more consumer goods are produced, the slope of the PPF becomes steeper, indicating that an increasingly larger amount of capital goods must be sacrificed for each additional consumer good.

Question 18

The short-run aggregate supply (SRAS) curve is upward-sloping. On a graph with the price level on the vertical axis and real GDP on the horizontal axis, this slope primarily reflects which of the following economic assumptions?

  1. The inverse relationship between the price level and the real value of household wealth.
  2. The positive relationship between the price level and the international competitiveness of domestic goods.
  3. The lag between changes in the final goods price level and adjustments in input prices, such as wages. (correct answer)
  4. The principle of diminishing marginal returns to capital and labor in the long run.
Explanation: The upward slope of the SRAS is best explained by the concept of 'sticky' input prices. When the overall price level rises, firms receive higher prices for their outputs. However, if input prices (especially nominal wages) are fixed by contracts in the short run, firms' real costs fall, and profitability increases. This incentivizes them to increase production, leading to the positive relationship between the price level and real GDP in the short run.

Question 19

In a standard market graph with price on the vertical axis, the market demand curve is downward-sloping. What does a vertical distance from the horizontal axis to a point on this curve represent?

  1. The total revenue a firm receives from selling that specific quantity of the good.
  2. The maximum price consumers are willing to pay for that specific unit of the good. (correct answer)
  3. The minimum price producers are willing to accept to sell that unit of the good.
  4. The consumer surplus generated by the consumption of that particular unit.
Explanation: The demand curve is a graphical representation of marginal benefit or willingness to pay. For any given quantity on the horizontal axis, the corresponding height of the demand curve (the vertical distance from the axis) shows the maximum price a consumer or group of consumers is willing to pay for that marginal unit.

Question 20

A binding price ceiling is imposed on a rental housing market that was previously in equilibrium. On a supply-demand graph, what is the unambiguous graphical consequence of this policy?

  1. Consumer surplus will increase as all renters now pay a lower price.
  2. The demand curve for housing will shift to the right due to the lower price.
  3. The supply curve for housing will shift to the left in the short run.
  4. A deadweight loss triangle will appear, representing a reduction in total economic surplus. (correct answer)
Explanation: A binding price ceiling creates a price below equilibrium. This causes the quantity supplied to decrease and the quantity demanded to increase, leading to a shortage. The number of units transacted falls from the equilibrium quantity to the quantity supplied at the ceiling price. This reduction in mutually beneficial trades creates a deadweight loss, which is the value of the trades that no longer occur. This is an unambiguous result, whereas the change in consumer surplus is ambiguous.