If marketers hold back products while waiting for the prices to go up, these products are not part of supply._____withdraw retreat preserve reserve我个人是可以排除掉retreat 和 preserve的，更倾向于选择reserve，但是答案给的是withdraw,但是没有解释，我也想不明白。我这个书确实有出现过错误，所以请大家帮我看看。