If the price of coffee increases significantly, and we observe a decrease in the quantity demanded for tea, what does this indicate about the relationship between coffee and tea?

When the price of coffee goes up a lot and people start buying less tea, it suggests that coffee and tea are related in some way. This relationship means that they are substitutes, which are products that can replace each other. For example, if coffee becomes too expensive, some people might choose to drink tea instead, but if both drinks are seen as similar, a rise in coffee's price can lead to a decrease in tea's demand. This situation shows how the price of one good can affect the demand for another, which is what we call cross-price elasticity of demand. In this case, since the price of coffee increased and tea's demand decreased, it indicates that consumers see these two drinks as alternatives to each other.