In this paper, we consider whether a firm that produces high-quality products chooses to produce lower-quality products. We find that when there is only one monopoly in the market, the monopoly will only produce a single-quality product. When there are two firms in the market, one produces high-quality products and the other one produces low-quality products. When certain conditions are met, the firm that produces high-quality products has an incentive to produce products of medium or lower quality, thus profiting. The production of new products by a firm will bring about the improvement of consumer surplus and social welfare.

中文翻译：

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寡头垄断市场中的企业自相残杀

在本文中，我们考虑生产高质量产品的公司是否选择生产低质量产品。我们发现，当市场上只有一个垄断者时，垄断者只会生产单一品质的产品。当市场上有两家公司时，一家生产优质产品，另一家生产劣质产品。当满足某些条件时，生产高质量产品的公司就有动力生产中等或较低质量的产品，从而获利。企业生产新产品将带来消费者剩余和社会福利的提高。