2. (a) What is the difference between a movement along the demand curve and a shift in the demand curve?In addition, what factor(s) can cause a movement along the demand curve, and what factor(s) can cause a shift in the demand curve?(b) To contrast, what is the difference between a movement along the supply curve and a shift in the supply curve?What factor(s) can cause a movement along the supply curve, and what factor(s) can cause a shift in the supply curve?