Therefore, the question of optimal advertising investment is always an analysis of the hot issues for business word and theory horizon.
因此，广告的最优投入问题一直是企业界和理论界的研究热点。
Therefore, the question of optimal advertising investment is always an analysis of the hot issues for business word and theory horizon.
因此，广告的最优投入问题一直是企业界和理论界的研究热点。
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