题目内容
Purchase of green goods provides a public good and is voluntary.
查看答案
搜索结果不匹配？点我反馈
更多问题
Purchase of green goods provides a public good and is required.
The amount of green goods is a public good and will be limited by free riding.
The amount of green goods is a private good and will not be limited by free riding.
Moral Suasion is about urging people to preserve the environment.
微信支付 
支付宝支付