negative external issues的用法和樣例：
例句
- Renting in groups refers to the housing phenomenon of living crowded and having bigger negative externalities.
群租是指居住擁擠併產生較大負外部性效應的居住現象。 - Some NTBS may restrict trade but improve welfare in the presence of negative externalities or informational asymmetries.
一些非關稅壁壘可能會限制貿易，而是改善福利，在存在負外部性或信息的不對稱性。
