What factors are important in determining the length of the imitation lag and the length of the demand lag? Explain.
在决定模仿滞后和需求滞后的长度时，哪些要素起着重要的作用？请解释。
This time-lag is difficult to explain, but there are three.
这种时滞现象很难解释，但可能有三个原因。
This time-lag is difficult to explain, but there are three possible reasons.
这种时滞现象很难解释，但可能有三个原因。
This time-lag is difficult to explain, but there are three possible reasons.
这种时滞现象很难解释，但可能有三个原因。
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