Explanation:

- Demand Curve: This graph represents the relationship between the quantity of a good consumers are willing and able to purchase at various prices, assuming other factors remain constant.

- Isocost Line: It shows all combinations of inputs (such as labor and capital) that have the same total cost, used in production analysis.

- Supply Curve: This graph depicts the relationship between the price of a good and the quantity that producers are willing and able to sell over a certain period.

- Budget Line: This graph illustrates all the combinations of two commodities that a consumer can afford, given market prices and their specific income level.