4. Which of the following would not lead to a rightward shift in the supply of bananas?
a. An increase in the price of bananas
b. A decrease in the cost of pesticides used in banana production
c. Development of a new variety of banana that ripens faster
d. All of the above will cause the supply to shift to the left
b. A decrease in the cost of pesticides used in banana production - as the output cost will be reduced, the supply curve moves leftwards