In the case of baseball cards being a normal good, an increase in income would lead to an increase in demand for baseball cards.
In a graph of supply and demand curves for baseball cards, this increase in demand would be represented by a rightward shift of the demand curve. As a result, the equilibrium point would move to a higher quantity and a higher price.
Therefore, the correct response is not listed among your options. However, if we frame the situation based on what you've provided:
The correct interpretation related to the demand increase (not supply) is:
- The equilibrium point would move to a higher quantity and price due to the increase in demand.
If you must select one from your provided responses, then the closest might be:
- "The equilibrium point would move upward along the supply curve because of the increase in demand."
This is because the increase in demand will lead the market to a new equilibrium point that would be at a higher price and quantity, although it is important to clarify that you are moving to a new equilibrium, not along the same supply curve.