The production of rice and yam on the same farmland is an example of

1. Analyze the question The question asks what kind of supply relationship exists when rice and yam are both produced on the same farmland. Land is a limited resource, so the key idea is how the two products relate to each other in their use of it.

2. Explain the concepts

• Joint supply: Two products come from a single production process, so producing one automatically yields the other. Examples are beef and hides, or mutton and wool.
• Composite supply: One product is demanded for several uses, and its supply is shared among them. Examples are electricity (for homes, industry, street lights) or crude oil (for petrol, kerosene, diesel).
• Competitive supply: Two or more goods compete for the same scarce resources. Producing more of one means producing less of the other. Examples are yam and rice on the same piece of land, or maize and cassava.
• Market supply: The total quantity of a good that all producers in a market offer at a given price.

3. Solution

• Rice and yam are two different crops, and neither is a by-product of the other, so this is not joint supply.
• Neither is a single product with multiple uses, so it is not composite supply.
• The farmer has only one piece of land. Using more of it for rice leaves less for yam, and the reverse is also true. The two crops compete for the same resource (land).
• This is the textbook case of competitive supply.

4. Answer The correct option is C. competitive supply.

5. Exam tip Match each term to a key word:

• Joint = "together" (one process, two products, like beef and hides)
• Composite = "one product, many uses" (like electricity)
• Competitive = "same resource, either/or" (like rice vs. yam on the same land)

When you see "same land," "same resource," or "either/or," think competitive supply.