Which case meets the economic meaning of demand for a good?

### Why this is right Demand means effective desire, so both willingness and ability to pay must be present. A wish without purchasing power is not effective demand. ### The concept Individual demand records how much one buyer would purchase at different prices during a stated period. Market demand adds the quantities demanded by all buyers. These schedules describe planned purchases, not merely a general liking for a product. ### The other options - **B. A person wants the good but has no ability to pay**: Desire alone does not create effective demand. - **C. A seller has produced the good but has no buyers**: This describes unsold supply, not demand. - **D. A person can pay but has no desire for the good**: Purchasing power without willingness to buy is not demand. ### Remember Economic demand requires both desire and ability to pay.