I'm scared to see the numbers of "incentives" that local politicians try and hand out to Amazon. There's little evidence that the public money used/lost will ever be recouped. One of the worst cases of this happening so far is the Foxconn deal in Wisconsin that will cost taxpayers around $4.5B [1], and I feel that numbers for Amazon will dwarf those Foxconn numbers.
The US is far removed from the days of trust busting [2], and keeping massive corporations (monopolies and oligopolies) and their market distorting effects in check, for the long-term benefit of the entire economy and the people. There seems to be a lot of similarities between now and the late 1800s and early 1900s. We live in a strange time. I get the feeling there will be a strong resurgence of antitrust cases and similar progressive policies. I'm curious to see where the near future takes us.
1: http://host.madison.com/wsj/news/local/govt-and-politics/mem... 2: https://en.wikipedia.org/wiki/Presidency_of_Theodore_Rooseve...