这显然是两种需求，对应的供给也不同：满足第一种需求的供给行为，可能（但未必）导致第二种供给的减少。

既然“供需对”不同，就是两个不同的市场，就好比，稻米市场和稻田市场也是两个不同市场。

我涉入不深，只是写了几篇评论文章。

“因此，若要全面考虑濒危动物保护中的激励机制，须辨识出两个不同的市场：一个是上面所说的动物个体及其制品的终端消费市场，另一个是野生种群的市场，种群数量与规模，首先将由后一市场的供需状况决定，然后再减去其中溢出到终端市场的数量。”

http://marginalrevolution.com/marginalrevolution/2012/01/hunting-endangered-species.html

Can hunting save an endangered species? Yes. In Africa hunting has been critical to the conservation of a number of species, despite the sometimes opposition of the United States which can prohibit US citizens from hunting even in foreign countries.

I was surprised to discover, however, that “some exotic animal species that are endangered in Africa are thriving on ranches in Texas, where a limited number are hunted for a high price.” Texas hunters have saved several endangered African species, unfortunately for the animals, the story does not end happily. Video from 60 Minutes below–some excellent material on incentives, ethics and conservation for classroom discussion.