If the price of good A decreases and the quantity demanded for good B increases, what can we infer about the relationship between these goods?

When the price of good A decreases and the quantity demanded for good B increases, it suggests that goods A and B are substitutes. This means that when good A becomes cheaper, people might choose to buy more of it instead of good B. However, if the demand for good B also goes up, it indicates that some consumers are likely switching from good A to good B, or they are buying both because they see good B as a better value. For example, if the price of coffee (good A) drops, and more people start buying tea (good B), it shows that tea is considered a substitute for coffee. This relationship helps businesses understand how changes in pricing can affect demand for their products.