·2,447,543篇论文数据，部分数据来源于NoteExpress
Grossman and Helpman, in particular, model producers as contributing financially to incumbent politicians in return for their providing or maintaining tariff protection.
特别是在格罗斯曼与赫尔普曼设立的模型中，生产者资助了当权政客，以换取关税保护的实行或维护。
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