A sudden increase in the price of coffee leads to a notable decrease in the quantity demanded of sugar. How would you classify the relationship between coffee and sugar based on elasticity concepts?

When the price of coffee suddenly increases, people tend to buy less coffee. Because coffee and sugar are often used together, this decrease in coffee consumption also leads to a drop in the quantity demanded for sugar. This relationship shows that coffee and sugar are complementary goods, meaning they are usually consumed together. In terms of elasticity, this situation indicates that the demand for sugar is elastic concerning the price change in coffee; when the price of one goes up, the demand for the other goes down significantly. For example, if someone usually enjoys coffee with sugar but decides to cut back on coffee due to its higher price, they will also use less sugar, showing how the two items are connected.