I need help with a researching these following questions for amazon:

1. How can ratio analysis be used to help analyze the liquidity and financial performance of your company? What ratios would you tend to use to measure liquidity and financial performance? Why?
2. In using ratio analysis, what source documents and/or other information would you need to have? Who might be other users of these financial ratios besides management of the company?
3. How could common size analysis, horizontal and vertical, be used to help analyze the financial performance of your company?