Mr. Donahoe says it is not the company's intent to discriminate against small sellers.
"It's going to be more and more difficult for small sellers to get noticed," she said.
Amazon wants to forge these kinds of close ties with other small sellers.
Delivery isn't free for larger orders, so the small sellers can be better for a cheap single purchase.
It has also lured an increasing number of small sellers to list their own products on Amazon.com, and takes around a 15percentt cut of each sale.
Similarly, Amazon's push to recruit the small sellers who orbited eBay was marked, at first, by patience and often-embarrassing experimentation.
Three independent, brick-and-mortar bookstores have filed a lawsuit against Amazon and the big six publishers, claiming that they are violating antitrust laws by collaborating to keep small sellers out of the e-book market.
Amazon, one of the fiercest opponents of state-level efforts to collect internet taxes, backs the federal law, while warning against too high a threshold for exempting small sellers, now set at $1m.
Even Amazon itself, the purported nemesis of the off-line book industry, allows small sellers to use its website to advertise their wares.Some small bookshops use supermarkets to their advantage, too.
The titles acquired by Amazon, mostly picture books, are mainly small sellers, but the move is likely to add to the unease that has settled over the industry as Amazon has moved deeper into publishing.
To small sellers like Joe Orlando of Fenwick Street Used Books and Music in Leonardtown, Md., megalisters treat books as "simply a widget that they can make a few bucks on".
