please write the referee report for the paper attached

Referee Report：The report should be less than two pages (single space, 12 fonts size, Times New Roman, Normal margin). In the report, you should include the following sections:

• Background and motivation (2 point)

• Research question (2 points)

• Data and study design (2 points)

• Findings and policy implication (2 points)

• Your comments and critiques (2 points)

Use your own understanding to write the report, copy and paste is not allowed.