兩間企業合併，比如化工廠污染了水造成了污水處理廠成本上升（不考慮所有其

兩間企業合併，比如化工廠污染了水造成了污水處理廠成本上升（不考慮所有其他的外部成本），那解決辦法就是讓化工廠把污水處理廠買下來，這樣企業為了利潤最大化也就將外部成本完全的內部化了。

結果 (英文) 1:

Two mergers, such as chemical pollution of water caused by the rising cost of sewage treatment plant (not taking into account all other external costs), and that the solution is to let the chemical plant sewage treatment plant to buy it, so that enterprises in order to maximize profits it the external costs fully internalized.

結果 (英文) 2:

A merger of the two companies, such as chemical plants polluting water, causes the cost of sewage treatment plants (regardless of all other external costs), and the solution is for the chemical plant to buy the plant, so that the company completely internalizes the external costs in order to maximize profits.

結果 (英文) 3:

The solution is to let the chemical plant buy the sewage treatment plant, so that the enterprise can fully internalize the external costs in order to maximize profits.