การอ่าน TOEFL

❓ คำถาม According to the passage, what is a primary reason why ecosystem services are often under-provided in free markets?

A. A. They are difficult to measure scientifically, making their value unknown.
B. B. They are public goods, which are non-excludable and non-rivalrous, leading to a lack of market incentives.
C. C. Governments tend to over-regulate these services, discouraging private investment.
D. D. Most ecosystem services are provisioning services that are already adequately priced.

B. They are public goods, which are non-excludable and non-rivalrous, leading to a lack of market incentives.