Economics (YEC11) เคล็ดลับการสอบ

โปรแกรมเครื่องคิดเลข

ข้อผิดพลาดที่พบบ่อย

1. 1highคะแนนที่เกี่ยวข้อง: 1Revenue, costs and profits

   Omitting the currency unit or magnitude signifier (e.g., 'billion' or 'bn') in final calculation tasks.

   วิธีหลีกเลี่ยง: Always check your final answers against the source table. If the data is presented in 'billion pounds' or 'millions', write the entire unit (e.g., '£19.4bn' instead of '19.4'). Edexcel mark schemes strictly award only 1 mark out of 2 if the currency/magnitude is missing.
2. 2highคะแนนที่เกี่ยวข้อง: 4Measures of economic performance

   Confusing a decrease in the rate of inflation (disinflation) with a decrease in the actual price level (deflation).

   วิธีหลีกเลี่ยง: Remember that as long as the inflation rate remains positive (e.g., falling from 5.3% to 4.9%), the average price level is still rising, but at a slower rate. Do not state that prices are falling unless the inflation rate becomes negative.
3. 3mediumคะแนนที่เกี่ยวข้อง: 2Aggregate demand (AD)

   Using generic 'Price' and 'Quantity' labels on macroeconomic aggregate demand / aggregate supply diagrams.

   วิธีหลีกเลี่ยง: For any AD/AS diagram (e.g., showing the impact of oil prices on France), always label the vertical axis as 'Average Price Level' (or 'Price Level') and the horizontal axis as 'Real Output' (or 'Real GDP' / 'Real Income'). Generic labels will cost diagrammatic application marks.
4. 4highคะแนนที่เกี่ยวข้อง: 5Macroeconomic objectives and policies

   Failing to explicitly ground evaluation points in real-world country contexts in Section D essays.

   วิธีหลีกเลี่ยง: To achieve Level 4 marks in Unit 2 or Unit 4 Section D essays, you must refer to real-world country data (e.g., Canada's unemployment, Italy's growth, South Africa's current account deficit, or Argentina's balances). Purely theoretical answers are capped to Level 3.
5. 5mediumคะแนนที่เกี่ยวข้อง: 4Government intervention in markets

   Drawing a maximum price ceiling above the free-market equilibrium or a minimum price floor below it.

   วิธีหลีกเลี่ยง: A maximum price is only binding and effective if set BELOW the market equilibrium, creating excess demand (shortage). A minimum price is only binding if set ABOVE the market equilibrium, creating excess supply (surplus).
6. 6mediumคะแนนที่เกี่ยวข้อง: 2Government intervention in markets

   Representing an ad valorem tax with a parallel supply shift instead of a pivoting supply shift.

   วิธีหลีกเลี่ยง: An ad valorem tax is a percentage-based tax, meaning the absolute tax amount increases as the price increases. You must pivot the supply shift outwards/upwards from the vertical axis so the vertical gap between the curves widens at higher prices.
7. 7highคะแนนที่เกี่ยวข้อง: 4Consumer behaviour and demand

   Failing to calculate percentage changes before finding elasticities (PED/YED/XED).

   วิธีหลีกเลี่ยง: Always calculate the percentage change using \( \frac{\text{New Value} - \text{Original Value}}{\text{Original Value}} \times 100 \) for both price and quantity before dividing them. Never directly divide raw unit changes.
8. 8mediumคะแนนที่เกี่ยวข้อง: 2Consumer behaviour and demand

   Omitting the negative sign in PED calculations or failing to interpret its magnitude correctly.

   วิธีหลีกเลี่ยง: Ensure you include the negative sign in your mathematical steps (since price and quantity demanded move in opposite directions). When interpreting, use the absolute value (magnitude) to determine whether demand is elastic (\( > 1 \)) or inelastic (\( < 1 \)).