May/June 2026 Paper 31

2026 · 30 questions · 30 parts · 30 marks

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29Trade Blocs Economic IntegrationHard1 mark
Countries Q and R form a customs union and remove tariffs on the goods they trade with each other. The diagram shows the effect of this on the market for wheat in country Q.
a supply-and-demand diagram for the market for wheat in country Q, with quantity of wheat on the horizontal axis and price of wheat on the vertical axis. An upward-sloping domestic supply curve S$_{Q}$ and a downward-sloping domestic demand curve D$_{Q}$ cross above two horizontal lines: S$_{R}$ + tariff at the higher price P$_{1}$, and S$_{R}$ at the lower price P$_{2}$. Two dashed vertical lines mark where S$_{Q}$ meets P$_{2}$ and where S$_{Q}$ meets P$_{1}$. Three areas against S$_{Q}$ are labelled: U, the triangle below P$_{2}$ down to the origin; V, the rectangle between the axis and the first dashed line, between P$_{2}$ and P$_{1}$; and W, the triangle between the two dashed lines, between P$_{2}$ and P$_{1}$.
Which area shows the change in the producer surplus for suppliers of wheat in country Q?