A-LevelEconomicsDemand and SupplyOct/Nov 2009Paper 1 Q91 Mark
The table shows the maximum price a consumer would be willing to pay for successive cans of fruit juice. [Table] The price of a can of fruit juice is $4 and, having bought three cans, the consumer decides to buy a fourth. How does buying the fourth can affect his consumer surplus?
AIt leaves it unchanged.
BIt lowers it by $2.
CIt raises it by $4.
DIt raises it by $34.
✓ Correct Answer
The correct answer is A: It leaves it unchanged.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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