an increase in depreciation a decrease in real gross domestic product (GDP) a war that creates a large amount of political instability a decrease in investment a decrease in capital Consider the following graph. What would cause a downward shift of the production function? a. an increase in depreciation b. a decrease in real gross domestic product (GDP) c. a war that creates a large amount of political instability d. a decrease in investment e. a decrease in capital Solution Answer:E .