Final answer:
The economist's statement indicates that the relationship between the price of Wheaties and the quantity purchased is being analyzed while assuming that all other factors affecting demand and supply remain constant.
Step-by-step explanation:
The economist's statement indicates that the relationship between the price of Wheaties and the quantity purchased is being analyzed while assuming that all other factors affecting demand and supply remain constant. This is what the ceteris paribus assumption means. For example, if the price of Wheaties decreases, assuming all other factors remain unchanged, it is expected that the amount of Wheaties purchased will increase.