It is tiring to hear that kind of argument all the time to determine if a business is a monopoly ( monopsonist ) or not and then it is supposed to be business 101 to know that people do not optimize their finance to the last cent and can be hooked into a company by habit or convenience.
What matters is if amazon clients actually do go around Amazon or not and based on what criteria. Google thinks of Amazon as a threat to their ads business because people use Amazon as their search engine for stuff to buy. I would say that a pretty good indication that the original author may have had a point.
> Setting up online stores is not rocket science ( to compete with Amazon )
Sorry but I can't read past that. Beside being insulting for anybody that has tried to put an online business together, can a economy journal be taken seriously when publishing that kind of statement in 2014 ?