Problem 1: Is it possible that you would purchase more of a good if its price rose? Is it possible that you would buy less of a good whose price falls? WHY or WHY NOT?
Problem 2: What is an inferior good?
Problem 3: What is the only determinant of demand that can have changed if there is a change in quantity demanded? What if there is a change in demand?
Problem 4: Why do changes in price expectations change demand today?
Problem 5: Do prices change demand for perishable or hard-to-store goods, like fresh vegetables or gasoline?