Two recent podcast episodes of note:

Drop-shipping with no overhead - guys who sell your product on another marketplace for a markup but don't deal with the returns and service! Interesting episode. 

https://www.npr.org/sections/money/2019/03/13/703014256/episode-724-cat-scam

This podcast is about Amazon.com's anti-trust issues, as it learns about your products through its marketplace, then develops and promotes its own branded competing offering. 

https://www.npr.org/sections/money/2019/02/22/697170790/antitrust-3-big-tech