https://www.reuters.com/article/us-amazon-com-trump/amazon-finishes-higher-despite-trumps-new-threat-on-shipping-rates-idUSKCN1HA1RR >Amazon.com Inc's shares took another ride on the roller-coaster on Tuesday, falling as President Donald Trump repeated his unsubstantiated claim that deliveries for the world's biggest online retailer cost the U.S. Postal Service money, then rising on a report that the White House is not considering any action against Amazon.