In one of my classes I am asked to conduct economic analysis of a firm, I chose Amazon, and I am having a tough time figuring out how they behave. I...

In one of my classes I am asked to conduct economic analysis of a firm, I chose Amazon,  and I am having a tough time figuring out how they behave. I was asked what market structure they are: I think they are a Oligopoly, they also ask what regulatory environment they have and what resource market they face. I am having difficulty answering what regulatory environment they have and the resource market. Any help would be appreciated