What are Public Goods? Explain their features with the help of examples. Is the efficient provision of a public good different than the efficient provision of a private good? Explain your response with the help of appropriate diagrams.

Public goods are a fundamental concept in environmental economics and public finance. They are goods that are non-excludable and non-rivalrous, meaning that their consumption by one individual does not reduce their availability to others, and no one can be prevented from using them. These characteristics create challenges for market allocation, often leading to market failure, which necessitates government intervention for their efficient provision.

### Features of Public Goods  

1. Non-Excludability  
   - This means that individuals cannot be excluded from consuming the good once it is provided. Even if they do not pay for it, they can still benefit from its use.  
   - *Example:* Clean air is a non-excludable resource. Everyone in a region benefits from pollution control efforts, regardless of whether they contribute to them.

2. Non-Rivalrous Consumption  
   - Consumption by one individual does not reduce the availability of the good for others.  
   - *Example:* National defense protects an entire country, and providing security to one individual does not reduce security for others.

3. Free-Rider Problem  
   - Due to non-excludability, individuals may choose not to contribute to the provision of the public good, expecting that others will pay for it while they still benefit. This leads to under-provision.  
   - *Example:* People may not voluntarily donate to environmental conservation efforts, assuming others will.

4. Externalities  
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