6. List at least three goods that could be considered substitutes for movie tickets. Critical Thinking 7. Summarize (a) Does a change in the price of a good cause the demand curve to shift? Why or why not? (b) What kinds of changes cause shifts in the demand curve? 8. Contrast How are normal goods and inferior goods different? 9. Contrast (a) If demand for a good increases, what will happen to the de demand for its complement? (b) What will happen to the demand for its substitute? (c) Explain why the changes in demand for the complement and the substitute follow different patterns.