问题描述：
英语翻译
We also define a set of variables to capture possible reference
effects related to the shipping fees.As with other elements
of the marketing mix,shipping fee policies may create
expectations of what shipping fees should be.As such,shipping
fee policies may create reference effects that can magnify response to changes in
shipping fee structure.
We also define a set of variables to capture possible reference
effects related to the shipping fees.As with other elements
of the marketing mix,shipping fee policies may create
expectations of what shipping fees should be.As such,shipping
fee policies may create reference effects that can magnify response to changes in
shipping fee structure.
问题解答：
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