1. Confusing “Demand” with “Quantity Demanded”
This is the most frequent “Level 1” error. Students often write, “An increase in price leads to a decrease in demand.” * The Mistake: A change in price causes a movement along the curve, not a shift of the curve.
- The Fix: Use the term “Quantity Demanded” for price changes and reserve “Demand” for non-price factors (like income or tastes).
2. The “Vague” Multiplier Process
When explaining how government spending (G) leads to economic growth, many students skip the transmission mechanism.
- The Mistake: Saying “Government spending increases GDP via the multiplier” without explaining the rounds of spending.
- The Fix: Explain that an initial injection of G creates income for households, which is then spent on domestic consumption (C), leading to further rounds of income generation, minus leakages (S + T + M).
3. Drawing “Generic” Diagrams
In the A-Levels, a diagram is a technical tool, not a sketch.
- The Mistake: Drawing a perfectly elastic supply curve when the text describes a resource-strapped industry.
- The Fix: Match your slopes to the Elasticity described. If a good is a necessity, the Demand curve should be steep (Inelastic). If it’s a luxury, it should be flatter (Elastic).
4. Over-Evaluating without Analysis
Evaluation (Ev) is worth 5 marks in an essay, but it must be earned.
- The Mistake: Jumping straight into why a policy fails (e.g., “This policy won’t work because of time lags”) without first explaining how the policy is supposed to work.
- The Fix: Follow the ACE structure—Analysis first, followed by Critical Evaluation. You cannot critique a “phantom” argument.
5. Ignoring the “Singapore Context”
Singapore is a Small and Open Economy. Students often suggest policies that work for the US or China but are disastrous for Singapore.
- The Mistake: Suggesting an increase in interest rates to fight inflation in Singapore.
- The Fix: Mention that Singapore is a price-taker in international financial markets, making interest rate pivots ineffective. Instead, focus on the S$NEER (Exchange Rate).
6. Mislabeling Externalities Diagrams
Market Failure is a high-probability topic, yet students consistently swap the curves.
- The Mistake: Labeling the supply curve as Marginal Private Benefit (MPB) in a pollution essay.
- The Fix: Remember that Supply = Cost (MPC/MSC) and Demand = Benefit (MPB/MSB). In a negative production externality (like factory smoke), the “gap” or deadweight loss is between MPC and MSC.
7. “Lifting” instead of “Using” Case Study Data
In Paper 1 (CSQ), students often copy sentences directly from the extracts.
- The Mistake: “According to Extract 1, GDP grew by 2%.” (This earns 0 marks).
- The Fix: Interpret the data. “The 2% rise in GDP suggests an increase in Aggregate Demand, likely driven by the 5% surge in export revenue mentioned in Figure 2.”
8. Weak Synthesis in the Conclusion
Most students end their essays by summarizing what they just wrote.
- The Mistake: A “Summary” conclusion.
- The Fix: A “Synthesis” conclusion. Provide a reasoned judgment. Which factor is the most important? Does the policy’s success depend on the state of the economy (e.g., whether there is spare capacity)?
9. Failing to Define Key Terms Early
Examiners use the introduction to see if you actually understand the question.
- The Mistake: Launching into an essay about “Market Power” without defining what a Monopoly or Oligopoly is.
- The Fix: Always start with 1-2 clear definitions of the primary economic variables mentioned in the prompt.
10. Poor Time Management (The “10-Mark Trap”)
Students often spend 30 minutes on a 4-mark CSQ and 10 minutes on a 10-mark “Discuss” question.
- The Mistake: Treating all marks as equal.
- The Fix: Use the 1 Mark = 1.8 Minutes rule. If a question is worth 10 marks, you have exactly 18 minutes. Once that time is up, move on.
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