When Emile goes grocery shopping, he usually buys milk and ice cream. He has noticed a positive correlation between the price of milk and the price of ice cream. Which fact would lead you to believe that the relationship between prices is one of causation and not correlation? Whenever milk is on sale, then ice cream is on sale. Milk is one of the major ingredients in ice cream. When the price of milk goes up, the price of sugar goes down. The prices of milk and ice cream both move with the rate of inflation