It's easy for them to go up but hard to come down. Secondly, the image of imported products as being high cost is already established. With the prices set high, the products will still sell as always. And the more expensive something is, the more people believe that it is a good product.
但一來價格有其「僵固性」，上得容易，下來難；二來進口貨的高價位形象已經鞏固，價格訂得高，照樣賣得掉，而且愈貴愈有人認為它是好貨。