Task: Explain what happens to the demand curve for electric cars if petrol prices rise sharply, and name one effect on petrol-car demand.
Rebuild the answer: model on the left, hint on the right. Then pick your choice-board level.
Model · Step 1
Petrol and electric cars are substitutes for many journeys.
Hint
Think: if one gets dearer, people look for alternatives.
Model · Step 2
Higher petrol prices make running petrol cars more expensive.
Hint
Running cost, not just sticker price.
Model · Step 3
Demand for electric cars rises at each price → demand curve shifts right.
Hint
More wanted even if EV prices stay the same.
Model · Step 4
Demand for petrol cars falls → demand curve shifts left (or quantity demanded falls along the curve if only petrol price rose).
Hint
Be careful: petrol price change is a movement along petrol-car demand; EV demand shifts.
Model · Step 5
Conclusion: EV demand shifts right; petrol-car demand is under pressure as buyers switch.
Hint
One clear sentence for the examiner.