State whether each of the following events below, 1a through 1d, will result in a movement along the demand
curve for McDonald's Big Mac hamburgers or whether it will cause the demand curve to shift. If the demand curve for Big Macs shift, indicate whether it will shift to the left or to the right and explain why the demand curve shifts to the left or to the right and what causes it to shift. Also, if the event has anything to do with a movement along the demand curve, explain why that particular event moves upward or downward along the demand curve. No graphs are necessary; just an explanation.
1a. the price of Burger King's Whopper Hamburger declines
1b. McDonald's distributes coupons for $1.00 off on a purchase of a Big Mac.
1c. Because of a shortage of potatoes, the price of French fries increases.
1d. Kentucky Fried Chicken raises the price of a bucket of fried chicken.