1·In principle, emission taxes and tradable emission permits are equally effective at limiting pollution.
原则上，排放税和可交易排放许可在限制污染上是一样有效的。
2·But it will take decades to introduce a system of tradable water rights, let alone market pricing, in most poor countries.
但引进一个可交易的水权利需要几十年，别说在大多数贫困国家进行市场定价。
3·In contrast to regulatory or administrative approaches, market-based instruments such as taxes and tradable permit schemes offer several advantages as a means of achieving environmental objectives.
同监管和行政措施相比，以市场为基础的工具，如税收和可交易许可证制度，提供了实现环保目标的诸多优势。
4·But PPP only applies to tradable goods that are easily exchanged across borders, like commodities or electronics.
不过，购买力平价仅适用于便于跨境交换的可交易商品，比如大宗商品或电子产品。
5·Partnerships can now offer limited liability and issue tradable shares.
合伙制现在可以具备有限责任并且发行可交易的股票。