【单选题】When oranges increase in price, the income effect (当桔子价格上涨时,收入效应——中文由在线翻译而来,仅供参考)
A.
decreases the consumption of oranges only if oranges are a normal good.只有当橘子是正常的食物时,才能减少橘子的消耗。
B.
decreases the consumption of oranges only if oranges are an inferior good.只有当橘子是劣等时才减少橘子的消耗。
C.
always increases the consumption of oranges.总是增加橘子的消耗。
D.
always decreases the consumption of oranges.总是减少橘子的消费。