Suppose that the PP in this equation refers to the price Julie is willing to pay for an additional magazine, and the QQ refers to the number of magazines to which Julie subscribes. Read the following statement carefully: “The more magazines Julie subscribes to, the less she is willing to pay for an additional magazine.” Which of the following best summarizes the pattern of causality suggested by this statement? A change in QQ causes a change in PP. A change in PP causes a change in QQ. The relationship between PP and QQ is not a causal relationship.