Final answer:
An increase in the price of orange juice would be best represented by a leftward shift in the demand curve for orange juice.
Step-by-step explanation:
The effects of an increase in the price of orange juice would best be represented by a leftward shift in the demand curve for orange juice. When the price of orange juice increases, consumers may choose to buy less of it, causing a decrease in demand. This decrease in demand is represented by a leftward shift in the demand curve.