The free market is the basic guarantee Netflix is counting on.[1] If Amazon 'jacks up it's prices', Netflix will simply move to another provider. Amazon is also unlikely to make sudden moves which disadvantage its customers, as any such moves will come at a tremendous cost of reputation, and many customers will leave and never come back (; as Amazon has no power to compel customers to purchase their services). In a market, no one has leverage, everyone simply has a position and an offer.