Which of the following is NOT an exception to the 'Law of Demand'?

In market economics, what primary factor leads to a sharp rise in vanilla market prices due to premature harvesting?

If two goods are close substitutes, how does a price change in one affect the demand for the other?

Product Y's sales have fallen in recent years due to a fall in disposable income of its major customers. Which microeconomic term best describes what has occurred in the demand curve for product Y?