Online retailing, on the ground delivery
Building out a decentralizewd, earth-bound material distribution system, versus building out online retail and cloud systems -- they represent different types of business management in the extreme. The distrubtion center, overnight delivery system and same day delivery in the big, green "Fresh" vans that I see on San Francisco streets, all of this has to be built up in a highly efficient manner by a company that's just gaining experience in the field. I don't know of another company that's trying to be both kinds of businesses. Amazon is trying to construct both for operation far into the future.