Final answer:
The demand for a product refers to how much of it consumers are willing and able to purchase at various prices, holding other factors constant. It aligns with the law of demand, where price and quantity demanded have an inverse relationship.
Step-by-step explanation:
When discussing demand for a product, we refer to the quantity that consumers are willing and able to buy at various prices, assuming that all other factors affecting demand remain constant. This concept adheres to the law of demand, which states an inverse relationship between price and quantity demanded. Specifically, as the price of a good or service rises, the quantity demanded typically falls, and as the price decreases, the quantity demanded usually increases.