1; What is the difference between a change (shift) in demand and a change in the quantity demanded? Provide an example. In your example be sure to note one of the specific non-price factors that can lead to a change in demand.

2; What is the difference between a change (shift) in supply and a change in the quantity supplied? Provide an example. In your example be sure to note one of the specific non-price factors that can lead to a change in supply.

3; What is the 'invisible hand principle?' Describe a real-world example of this economic phenomenon.