Explain the concept of substitute goods and illustrate the demand relationship between them using graphs.

Substitute goods are products that can be used in place of each other to satisfy the same want or need. Consumers often choose between them based on factors like price. Step 1: Define substitute goods. Substitute goods are products that serve a similar purpose and can be consumed interchangeably. For example, tea and coffee are substitutes, as are butter and margarine. Step 2: Explain the demand relationship. There is a direct relationship between the price of one substitute good and the demand for the other. If the price of good A increases, consumers will tend to switch to its substitute, good B. This causes the demand for good B to increase, even if its own price remains constant. Step 3: Illustrate with relevant graphs. To illustrate this relationship, two demand-supply graphs would be used: • Graph 1 (for Good A): This graph shows the demand and supply for good A. An increase in the price of good A (e.g., from P_1 to P_2) would lead to a movement along its demand curve, resulting in a decrease in the quantity demanded for good A (e.g., from Q_1 to Q_2). • Graph 2 (for Good B): This graph shows the demand and supply for good B, the substitute. Because consumers are buying less of the now more expensive good A, they will switch to good B. This causes the entire demand curve for good B to shift to the right (e.g., from D_1 to D_2). This shift indicates an increase in the demand for good B at every price level, leading to a higher equilibrium price and quantity for good B. 3 done, 2 left today. You're making progress.