Answer:
d. normal; left; fall
Step-by-step explanation:
A shift in the demand curve of a product results from a change in other factors except from price. It results in a change in quantity demanded at all prices.
A shift to the right will result in an increase in quantity demanded at all price levels, while a shift to the left results on a decraese in quantity demanded at all price levels.
This is illustrated in the attached diagram. When there is a sudden decrease in income, it will result in less money available for buying baseball's.
The customer is only willing to buy at a lower price and quantity they can buy also decreases.
In the diagram there is a fall in price from P to P1, and a fall in quantity demanded from Q to Q1