By contrast, volatility does not necessarily hurt consumers, because different food staples are often substitutable.
而价格波动，恰恰相反，不一定会损害消费者利益，因为不同的主食是可以互相替代的。
In contrast, heterogeneous products differ significantly from each other and are not easily substitutable.
与此相反，异质产品之间存在显著的差距，是不容易互相替代的。
In contrast, heterogeneous products differ significantly from each other and are not easily substitutable.
与此相反，异质产品之间存在显著的差距，是不容易互相替代的。
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