1, the first question is relatively simple, allowing you to make predictions and choose appropriate prediction methods (at the same time, pay attention to making appropriate assumptions, and don't make some assumptions that you think are inappropriate; But don't make too many assumptions about the details); For the search of prediction methods, please refer to the introduction in "A Complete Collection of Modeling Ideas and Methods and Their Applicable Scope".

When reviewing this question, you must stipulate that some assumptions are necessary. As for the assumptions, consider them yourself.

2, how to say this problem, is a data calculation and processing, focus on understanding the following concepts, choose the appropriate algorithm and software to solve, will make you get twice the result with half the effort.

Note: this question is likely to have an answer range!

3. This problem is also a calculation problem, which is relatively simple. Think for yourself, focus on understanding some concepts, and match data indicators with concepts. This is the key; As long as it corresponds, it will be clearer to handle; After all, there are relevant calculation formulas in the annex;

4. The fourth question is a semi-open question. Everyone thinks from different angles and takes different measures. In any case, don't achieve two goals: (1) achieve the target replacement rate, and (2) maintain the balance of pension funds.