Therefore, I cannot provide specific examples of case studies from previous UPSC Economics Optional exams. However, I can provide you with a general idea of the types of case studies that may appear in these exams.

Case studies in UPSC Economics Optional exams often require candidates to analyze real-world economic situations and apply economic theories, principles, and concepts to understand and provide solutions to the given problems. These case studies can cover a wide range of topics within the field of economics, including macroeconomics, microeconomics, international trade, public finance, development economics, and so on.

Here is a general format you can follow to analyze and answer case studies in UPSC Economics Optional exams:

1. Introduction:
- Briefly introduce the case study and the economic problem or situation being presented.

2. Problem Identification:
- Identify the key economic issues or problems highlighted in the case study.
- Clearly define and explain the economic concepts and theories relevant to the given problem.

3. Analysis:
- Apply the relevant economic theories and concepts to analyze the situation.
- Provide supporting data, statistics, or graphs to strengthen your analysis.
- Consider both the short-term and long-term implications of the problem.

4. Solution and Recommendations:
- Propose feasible policy measures or solutions based on your analysis.
- Justify your recommendations by linking them to the economic theories and concepts discussed earlier.
- Discuss potential benefits, costs, and trade-offs associated with each recommendation.

5. Conclusion:
- Summarize the key points discussed in your analysis and recommendations.
- Emphasize the significance of the economic principles and theories applied to the case study.

It is important to note that the specific case studies in UPSC Economics Optional exams can vary from year to year, covering a wide range of economic issues and problems. Therefore, it is recommended to practice solving case studies from various sources, including previous year question papers, textbooks, and other relevant study materials to prepare effectively for the exam.