Question

Which of the following will NOT cause a change in the demand for coffee (illustrated by a shift in the demand curve)
1. An increase in the price of coffee
2. A decrease in the price of milk, a complement
3. An increase in the number of people drinking coffee
4. An increase in the income of households

Answer 1

An increase in the price of coffee will NOT cause a change in the demand for coffee (illustrated by a shift in the demand curve), because it will cause a movement along the demand curve.
So, the correct answer is 1.