题目内容
The efficient level of emissions can never be reached, regardless (无论) of which party has the property rights.
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ForProperty Rights to be effective there must be market like conditions.
In the production of clean energy an improvemnent in technology will produce more clean energy at a lower cost.
In the production of clean energy an improvemnent in technology will produce less clean energy at a higher cost.
Purchase of green goods provides a public good and is voluntary.
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