While I think it's true that this is at least partially motivated by potential tax-incentives, it's also a smart diversification move by Amazon. Right now they'

While I think it's true that this is at least partially motivated by potential tax-incentives, it's also a smart diversification move by Amazon. Right now they're at the mercy of the Seattle voter, which is a dangerous place to be for a large corporation. Diversifying headquarters creates competition and gives them leverage.