Final answer:
A decreasing number of ice cream shops would lead to a taste shift, a decrease in the population likely to buy, a decrease in income, and a fall in the price of substitutes in the market for ice cream.
Step-by-step explanation:
When the number of ice cream shops decreases, it would have several effects on the market for ice cream. First, there may be a taste shift to lesser popularity, meaning that people may not desire ice cream as much as before. This would result in a decrease in the population likely to buy ice cream. Additionally, there might be a decrease in income, especially for ice cream as a normal good, meaning that people would have less money to spend on ice cream. Finally, if the number of ice cream shops decreases, the price of substitutes might fall, making them more attractive to consumers.