Final answer:
Factors that can cause a leftward shift in the market demand curve for guacamole include an increase in the price of avocados and a decrease in consumer income.
Step-by-step explanation:
Several factors can cause the market demand curve for guacamole to shift leftward (a decrease in demand).
An increase in the price of avocados: If the price of avocados increases, the cost of producing guacamole will rise, leading to a decrease in the quantity demanded and a leftward shift in the demand curve.
A decrease in consumer income: If consumers have less income, they may prioritize other goods over guacamole, reducing their demand for it and causing a leftward shift in the demand curve.
An increase in the popularity of guacamole: This statement is incorrect. An increase in the popularity of guacamole would actually shift the demand curve rightward (an increase in demand) as more people would be willing to buy it at any given price.
Therefore, factors 1 and 2 can cause a leftward shift in the market demand curve for guacamole.