I agree with you that ratio is an indicator to gauge how good or bad the company is based on financial history, However it is a bit different for big companies. typically when they analyze big company they look at it from 3 to 5 years. For another example, you can look Super Micro Computer Inc. They did a lot better for the year of 2016 and 2017 than 2018. In my opinion, people still support them and expect a better future for the company. Also, It is important to sustain in the market as they are the only competitor to Intel and it is not good for the market to be controlled by one company only that’s why a lot of company helps Super micro to service. we learned today how to do basic calculations and look into a company financial profile so you can refer to SMCI online to check the financials for the company.