Amazon ( AMZN 2.77% ) is an online retail powerhouse, selling and delivering its own products and acting as a middleman for other retailers. The company's delivery trucks are ubiquitous in some areas of the country. But it has even bigger aspirations when it comes to getting products to customers.

So why did United Parcel Service ( UPS 1.38% ) decide to stop handling as many Amazon deliveries?

The Amazon and UPS breakup

As with any good breakup drama, the story between Amazon and UPS, as United Parcel Service is called for short, is hard to call. UPS says that the Amazon business it was doing was high volume, but low margin. That meant that it didn't add enough to the bottom line to make it worth the top-line benefit. UPS says it plans to step away from half of the busine

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