Data, Model, Decision Individual final course report scores account for 50% of the total score. Please select one of the following topics, choose your own perspective, and complete a course report (2000 words). You need to design and describe the research problem according to the selected topic, establish a mathematical model and solve it. You can design different types of problems and use multiple models. At least one SPREADSHEET model is requested to be included in the report and solved by excel solver tool. Submission form: WORD or PDF with screenshot of solution result inserted into the file. The requirement of the screenshot is as follows. Take solver tool as an example. You need to show the settings of the solver and take a screenshot together with the spreadsheet containing the solution result. In addition, one of the attachments needs to be submitted as a EXCEL file. In the excel file you need to put each model solution result into different sheet. Font: Times New Roman; Font size: 4; Line spacing: 1.5 times. The report is requested to include the title, abstract, keywords, conclusions and references. All documents should be submitted as attachments. Topics: 1. The stall economy in the post-epidemic era 2. market operation for designer toy product 3. operation of Short video platform 4. Consumer privacy concerns and platform operations 5. Service innovation and and profit model innovation in the express delivery industry