I researched Amazon and these were my findings as of June 2017:

Gross Profit Margin: 38.98%
Operating Profit Margin: 2.31%
Net Profit Margin: 1.28%
ROE: 8.28%
ROA: 2.19%
ROI: 4.58 %

The gross profit margin is relatively high, and has improved compared to the last several years. However, the operating profit margin and net profit margin are relatively low, especially compared to the companies that were mentioned above, indicating that Amazon is spending almost all the money they make. This isn’t necessarily bad if the company is investing in new technology that will generate high revenue in the future. The ROI is not very high either, and has decreased from last year also.

https://www.stock-analysis-on.net/NASDAQ/Company/Amazoncom-Inc/Ratios/Profitability/Quarterly-Data#Ratios-Summary
https://csimarket.com/stocks/AMZN-Return-on-Investment-ROI.html