https://www.cnbc.com/2018/04/13/post-office-rate-hike-could-cost-amazon-up-to-1-point-8-billion-more-per-year-credit-suisse.html

President Donald Trump's recent focus on what the post office charges Amazon for delivery may cost the e-commerce retailer a significant amount of money, according to one Wall Street firm.

Credit Suisse ran the numbers on how much more it will cost Amazon if the United States Postal Service raised its rates by 15 to 20 percent. In recent weeks Trump repeatedly blasted Amazon on Twitter, sparking a decline in the company's share price. The president criticized the e-commerce retailer over taxes and claimed it has not paid the post office adequately for its delivery services.