each of the following events determine whether it would cause a shift of the demand curve or a movement along the demand curve. Shift or Movement Along Demand Event The price of a complementary good changes Incomes in the economy change the good is a normal good. Incomes in the economy change the good is an inferior good. The price of the good itself increases. The price of a substitute good changes. each of the following events determine whether it would cause a shift of the demand curve or a movement along the demand curve. Shift or Movement Along Demand Event The price of a complementary good changes Incomes in the economy change the good is a normal good. Incomes in the economy change the good is an inferior good. The price of the good itself increases. The price of a substitute good changes