If the cross-price elasticity of demand between coffee and tea is negative, this implies that an increase in the price of coffee will lead to an increase in the quantity demanded for tea.

Cross-price elasticity of demand measures how the quantity demanded of one good changes when the price of another good changes. If the cross-price elasticity between coffee and tea is negative, it means that coffee and tea are complementary goods. This means that when the price of coffee goes up, people might buy less coffee, and as a result, they will buy more tea instead because they often consume them together. For example, if coffee becomes more expensive, someone who usually drinks both might decide to buy more tea to enjoy with their breakfast instead of coffee. Thus, a negative cross-price elasticity indicates that when the price of one item rises, the demand for its complementary item increases.