monopoly marginal cost

例句：

1. 1. Thecompany has a monopoly on the marketfor its product.
   该公司对其产品的市场拥有垄断权。
2. 2. The government is trying to breakup the monopoly and open up morecompetition.
   政府正试图打破垄断，增加竞争。
3. 3. The monopoly was eventually broken whenthe new competitor entered the market.
   当新的竞争对手进入市场时，这个垄断最终被打破了。