6. The price of a gallon of milk falls. Which of the following is a possible cause?
(A) Milk is a normal good and people’s incomes rise.
(B) a decrease in the price of oatmeal, a complement to milk
(C) a discovery that milk cause diabetes
(D) a drought that reduces supplies of feed grains fed to cows that produce milk
阿摩線上測驗
登入