Amazon could face a significant impact from Donald Trump's new tariffs on Chinese imports.Morgan Stanley estimates Amazon to be the most-exposed among e-commerce companies the bank covers.A large chunk of Amazon's third-party sellers are also China-based.Amazon could be one of the hardest-hit e-commerce retailers by new tariffs on imports from China. Morgan Stanley wrote in a note on Monday that roughly 25% of the cost of products directly sold by Amazon come from China, exposing them to the new tariffs. Th ...