Answer: Increase, Least
Step-by-step explanation:
According to the law of demand, when the price of a goods falls, the quantity demanded for that good will increase. That is demand is inversely related to its price. The consumers buy more when the price is lowest and the least when the price is the highest.
This means that as the price of a popular cereal falls, the demand for the cereal will increase.
So at the highest price, you would expect the demand for goods and services to be the least.