Which of the Following Is a Difference Between Aggregate Demand

Multiple Choice

Which of the following is a difference between aggregate demand and the demand for a single product when price changes?

A) The wealth effect applies to demand for a single product but cannot affect aggregate demand because it includes all products.
B) The wealth effect applies to aggregate demand but not to demand for a single product because the purchasing power of money has no impact on individual product purchases.
C) The substitution effect applies to demand for a single product but cannot affect aggregate demand because aggregate demand includes all products.
D) The substitution effect applies to aggregate demand but not to demand for a single product because there is nothing to substitute when there is just one type of product.