What does a perfectly inelastic demand curve look like?

Hellmann’s mayonnaise and Duke’s mayonnaise are substitutes from the consumer’s perspective.  When the price of Hellmann’s rises, what happens to the demand for Duke’s mayonnaise?

If the price of movie tickets rises, what happens to the demand for coke (a complement)?

France has the largest long-run elasticity of oil demand (the most elastic) of any of the large, rich countries, according to estimates.  Does this mean that France is better at responding to long-run price changes than other rich countries, or does it mean France is worse at responding?

An increase in consumer income for a normal good will:

Which of the following scenarios would cause the demand curve for computers (a normal good) to shift to the right?

A bakery increases the price of its cakes by 12%, and the quantity supplied rises by 18%. What is the elasticity of supply?

Which of the following will NOT cause a shift in the demand curve?

The book discusses a filmmaker’s tendency to emphasize clarity over fidelity in film. Which of the following is an example of this concept?

The first moving pictures and silent films were shown