demand for a product is measured not only by consumer desire for a product, but also by\na opportunity…

demand for a product is measured not only by consumer desire for a product, but also by\na opportunity costs.\nb competition for the consumer.\nc demand for all similar products.\nd ability and willingness to buy the product.\ne price elasticity
Answer
Brief Explanations:
In economics, demand is not just about desire. It requires the consumer's ability and willingness to pay for the product. Opportunity costs, competition, demand for similar products, and price - elasticity are related but not the defining factors for measuring demand.
Answer:
D. ability and willingness to buy the product.