Complementary commodities refer to two or several related commodities that jointly meet the same desire of consumers. Under the condition that consumers' hobbies, monetary income and other commodity prices remain unchanged, if the decline in the price of commodity A causes an increase in the demand for commodity B, commodity A and commodity B are complementary commodities
According to the above definition, which of the followings belongs to complementary commodities :
In order to alleviate the traffic pressure, some regions have issued automobile purchase restriction orders, which has reduced the price of some cars. At the same time, due to the shortage of oil, the price of gasoline is rising