8. Changes in consumers' incomes and tastes and preferences are only two of the factors that can affect the demand for a good. Below, brainstorm and clearly explain other possible factors that could cause demand for oil to increase and decrease. a. Achange in the price of substitute goods: i. Would cause demand for oil to increase: ii. Would cause demand for oil to decrease: b. Achange in the price of a complementary.r good: i. Would cause the demand for oil to increase