The analysis of this part mainly includes:(1)Essential economic school of thought, such as Keynesian and Monetarist and the school of logos anticipation etc.

这一部分的分析主要包括：（1）主流经济学派如凯恩斯学派、货币主义学派、理性预期学派等的观点。

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More recently, many states have begun offering a sort of middle ground: A variation on the traditional design -- professional sports team logos, calls to nature conservation, celebrations of the arts, etc.

BBC: Flags on car plates - right or wrong?