The supply of light could be met using a candle, lantern and gas lamp. This is an example of a

Analyze the question: Light can be supplied by different sources: a candle, a lantern, or a gas lamp. These are different products that all satisfy the same want (light). We need the supply term that describes this.

Explain the concepts:

• Joint supply: One production process yields two or more products together, so supplying one automatically supplies the other (e.g., beef and hide, cotton and cotton seed).
• Complementary supply: Not a standard term. Complementary goods are used together (e.g., car and fuel).
• Competitive supply: Different goods that use the same resources or serve as alternatives, so producing more of one means producing less of another.
• Composite supply: A good supplied from several different sources, or several different goods that meet the same want. Examples are light from candles, lanterns and gas lamps, or electricity from hydro, gas and solar.
• Abnormal supply: Supply that behaves unusually, such as a backward-bending supply curve of labour.

Solution:

1. Candle, lantern and gas lamp are different products.
2. They are not produced together from one process, so it is not joint supply.
3. They are not used together, so it is not complementary.
4. They are alternative sources that all meet one need, light. This is composite supply.

Answer: D. composite supply.

Tip: Remember the word "composite" as "composed of many sources" for one end product. Joint supply is "one process, many products". Composite supply is "many sources, one want".