The quantity of commodity a consumer is willing and able to buy at a particular time is called

1. Analyze the question The question asks for the term that describes the quantity of a commodity a consumer is both willing and able to buy at a particular time.

2. Explain the concept In Economics, demand is the quantity of a good or service that a consumer is willing and able to buy at a given price during a given period of time.

Two conditions must be met:

• Willingness: the consumer wants the good.
• Ability: the consumer has the purchasing power (money) to pay for it.

If either is missing, it is not demand in the economic sense.

3. Go through the options

• A. Supply: the quantity of a good a producer or seller is willing and able to offer for sale at a given price. This is the seller's side, not the consumer's.
• B. Wish: a mere hope for something, with no backing of purchasing power.
• C. Demand: the consumer's willingness and ability to buy. This matches the question.
• D. Desire: a want or craving for something, but without the ability to pay. It is not effective demand.

4. Answer The correct option is C. demand.

5. Exam tip Remember the pairing:

• Demand = Buyer, with willingness + ability to pay (effective demand).
• Supply = Seller, with willingness + ability to offer.

Whenever you see "willing and able" together with a consumer, think demand. Wishes and desires alone, without money, are not demand.