An upward movement along the same supply curve result in_____________

1. Analyze the question The question asks what an upward movement along the same supply curve means. The key phrase is "along the same curve", which tells us the supply curve itself does not shift.

2. Explain the concept

• A movement along the supply curve is caused only by a change in the price of the good itself. It is a change in quantity supplied.
• A shift of the supply curve is caused by other factors (cost of production, technology, taxes, subsidies, number of sellers, weather, etc.). It is a change in supply.

The supply curve slopes upward because of the law of supply: higher price means producers are willing to supply more.

3. Step-by-step solution

• On a supply curve, price is on the vertical axis and quantity on the horizontal axis.
• Moving upward along the curve means the price is rising.
• As price rises, producers supply more, so the point also moves to the right.
• This is called an expansion (extension) of supply, which is an increase in quantity supplied.

Checking the options:

• A. A decrease in price: this would be a downward movement. Wrong.
• B. "An increase": incomplete, and it does not say what increases. If it meant "increase in supply", that would be a shift of the curve, not a movement along it. Wrong.
• C. An increase in quantity supplied: correct.
• D. A decrease in quantity supplied: this is a downward movement (contraction). Wrong.

4. Answer The correct option is C, an increase in quantity supplied.

5. Exam tip Remember: "Movement = Quantity, Shift = Supply."

• Price changes cause movement along the curve, so the quantity supplied changes.
• Non-price factors cause a shift of the curve, so supply changes.

JAMB often tests this distinction, so watch the wording "along the same curve".