Offering low marginal cost items for free is a shortcut to generating word of mouth, which is a lot cheaper than buying ads.
免费提供边际成本较低的产品或服务是建立良好口碑的捷径，比你花钱做广告可便宜多了。
The paper studied pricing strategy research of power plant based on real-time generating cost and system marginal price prediction under the deregulated power system.
本文研究了火电厂在电力市场环境下基于实时发电成本分析与系统边际电价预测相结合的发电企业报价策略研究。
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