Final answer:
The supply curve for tickets to football games at a stadium with 70,000 seats is vertical.
Step-by-step explanation:
The shape of the supply curve for tickets to football games at a stadium with 70,000 seats would typically be a vertical line.
In economics, the supply curve represents the relationship between the price of a good and the quantity supplied by sellers. In this case, the stadium has a fixed number of seats available, regardless of the price of the tickets. Therefore, the quantity supplied remains constant at 70,000 seats, resulting in a vertical supply curve.
This means that the price of the tickets may vary, but the number of available seats will not change.