Price Determination — Data Response Practice

Edexcel IAL Economics Unit 1 (WEC11)

Stimulus

Red Sea disruption and Panama drought reshape global shipping costs

The global container shipping market has experienced a volatile period since late 2023, when Houthi attacks on commercial vessels in the Red Sea forced major carriers including Maersk, MSC and Hapag-Lloyd to reroute container traffic around the Cape of Good Hope. The diversion adds approximately 10–14 days to the journey between Shanghai and Rotterdam, increasing fuel consumption and insurance premiums. The Drewry World Container Index, a widely followed benchmark, rose from around USD 1,400 per 40ft container in November 2023 to a peak of roughly USD 4,800 by mid-2024, before easing to approximately USD 2,900 by early 2026 as capacity adjusted.

At the same time, the Panama Canal continued to face drought-related transit restrictions through late 2023 and into 2024, with daily ship crossings cut from a normal level of around 36 to as few as 22 during the most severe period. Although rainfall partially restored reservoir levels through 2024, the combined effect of the two chokepoints pushed many Asia–Europe and Asia–US East Coast routes into a supply-constrained equilibrium. Shipping analysts at Lloyd's List estimate that the disruptions added between USD 300 and USD 500 to the landed cost of a typical consumer electronics container heading into European ports during 2024.

For exporters in Singapore, Hong Kong and Vietnam, the price effects have been uneven. High-value, low-volume exports such as semiconductors absorbed the cost more easily, while textile and furniture exporters in Sri Lanka and Bangladesh faced thinner margins. On the demand side, European retailers responded by accelerating orders ahead of the 2024 peak shopping season to build inventory, intensifying pressure on available container capacity and shifting the demand curve for shipping services further to the right.

Table 1: Drewry World Container Index — Shanghai to Rotterdam (USD per 40ft container)

Source: Composite, based on Drewry Supply Chain Advisors published indices.

Questions

Question 1 (2 marks) — Using data from Table 1, calculate the percentage change in the Drewry World Container Index between November 2023 and July 2024.

Question 2 (6 marks) — Analyse, using a supply and demand diagram, how the Red Sea disruption and Panama Canal restrictions led to a new equilibrium price for container shipping between Asia and Europe.

Question 3 (10 marks) — Discuss the extent to which the 2023–2024 shipping price shock affected consumer surplus and producer surplus in the global container shipping market.

Model Answers

Question 1 (2 marks)

Percentage change = ((4,800 − 1,400) / 1,400) × 100 = +242.9% (or approximately +243%). The Drewry index rose by around 243% over the eight-month period between November 2023 and July 2024.

Examiner note: Full marks require the formula, the calculation, and a clear percentage expressed correctly. A common mistake is to calculate the difference (3,400) and write it as the answer without dividing by the original value.

Question 2 (6 marks)

In a free market, equilibrium price is determined where quantity supplied equals quantity demanded. On a diagram for container shipping services, the horizontal axis shows the quantity of container slots (in TEU) and the vertical axis shows freight rate (USD per 40ft container).

Applied to the stimulus, the Red Sea disruption forced rerouting around the Cape of Good Hope, adding approximately 10–14 days to journeys, which raises fuel, crew and insurance costs per voyage. This shifts the supply curve for Asia–Europe shipping leftward, because at any given freight rate carriers can supply fewer completed voyages per month. Simultaneously, the Panama Canal drought cut daily transits from around 36 to as few as 22, further reducing effective supply on Asia–US East Coast routes.

On the demand side, European retailers accelerated inventory ordering ahead of the 2024 peak season, shifting the demand curve rightward. The chain of reasoning is: leftward supply shift combined with rightward demand shift means equilibrium price rises unambiguously, while the effect on equilibrium quantity depends on the relative magnitudes of the shifts. The Drewry index rise from USD 1,400 to USD 4,800 — a 243% increase — is consistent with a large leftward supply shift dominating. The new equilibrium is at a higher price and a quantity determined by how severely capacity is constrained.

Examiner note: Level 3 (5–6) answers clearly separate the two curve shifts, label both axes correctly, and link the 243% figure to the magnitude of the shift. Level 2 (3–4) answers describe the events but do not use correct supply/demand terminology. A common mistake is conflating a shift of the supply curve with a movement along it.

Question 3 (10 marks)

Consumer surplus is the difference between what consumers (in this case, shippers/importers) are willing to pay and what they actually pay, while producer surplus is the difference between the price producers (carriers) receive and the minimum price they would accept. The 2023–2024 shipping price shock significantly altered both.

First, the shock reduced consumer surplus. As the Drewry index rose from USD 1,400 to a peak of USD 4,800 — a 243% increase — European importers and retailers paid substantially more for each 40ft container. On a standard diagram, the upward shift in equilibrium price reduces the area above the price line and below the demand curve, which is consumer surplus. The Lloyd's List estimate of USD 300–500 added to the landed cost of a typical consumer electronics container implies a large transfer from importers to carriers. Where PED on the demand side is relatively inelastic — as is the case for retailers with committed peak-season orders — consumer surplus falls by more, because quantity demanded does not adjust proportionately to price.

Second, producer surplus for shipping lines rose sharply. Maersk, MSC and Hapag-Lloyd reported significantly improved earnings during the peak of the disruption, reflecting the higher price being paid on each remaining container moved. The area below the equilibrium price and above the supply curve expanded. However, this gain was partially offset by higher operating costs from the longer Cape of Good Hope route, because supply costs (fuel, crew, insurance) also rose. The net producer surplus gain depends on the gap between the price rise and the cost rise.

However, this analysis requires several evaluators. First, the distributional effect is uneven across producers and consumers. High-value, low-volume exporters (semiconductors) absorbed the cost more easily than textile and furniture exporters in Sri Lanka and Bangladesh, whose thinner margins were squeezed. This suggests the welfare loss was concentrated in price-sensitive, low-margin segments, eroding their producer surplus in the downstream market even as carriers gained.

Second, time horizon matters. By January 2026, the index had fallen to approximately USD 2,900, partially restoring consumer surplus as capacity adjusted. This illustrates the self-correcting nature of a market: high prices incentivise new capacity (more vessels redeployed, returning Red Sea transit once security improves), which shifts supply back rightward.

Third, the price signal arguably played a useful allocative role. By rationing scarce shipping capacity to buyers willing to pay the highest price — such as time-critical electronics shipments — the market moved containers to their most valued uses. Welfare loss from under-allocation would have been larger under price controls.

Overall, the price shock caused a clear reduction in consumer surplus for importers and a clear but partly eroded rise in producer surplus for carriers. The magnitude and persistence of these changes depend on PED on the demand side, the durability of the supply shock, and the speed at which capacity can respond. A balanced judgement is that the shock redistributed surplus from importers to carriers in the short run, but the market's self-correction by 2026 limited the long-term welfare cost.

Examiner note: Level 4 (9–10) answers explicitly use both surplus concepts with diagrammatic reasoning, quantify using the USD 1,400 → USD 4,800 → USD 2,900 path, and evaluate using time horizon, PED, and allocative role. Level 3 answers describe surplus changes but do not reach a judgement on magnitude or self-correction. A common mistake is assuming carriers' producer surplus rose by the full price increase, ignoring the cost rise from rerouting.

Common Mistakes

• Shifting the demand curve when the question is about supply (or vice versa). Fix: ask "did this change the cost of producing or the willingness to pay?" Supply shocks shift supply; taste/income shocks shift demand.
• Writing "quantity went up because price went up". Fix: a movement along the demand curve shows the opposite relationship; you need a curve shift for both price and quantity to move in the same direction.
• Calculating a percentage change by dividing by the new value instead of the original. Fix: always use the original (starting) value as the denominator.

Diagram Reference

This data-response uses the following diagrams from the Revvy Learn diagram library:

• supply-demand-equilibrium.svg — leftward shift of the supply curve causing higher price and lower quantity
• supply-demand-equilibrium.svg — leftward supply shift combined with rightward demand shift, showing ambiguous quantity effect
• consumer-producer-surplus.svg — labelled CS and PS areas at equilibrium, with effect of a price rise shown