US grocery market, though it would likely have a disproportionate impact on its future. Watch Rio 2. Amazon has largely avoided antitrust scrutiny by arguing it competes on price and quality, not abuse of its market position, though critics have repeatedly warned buying a major brick and mortar chain could be a prelude to another type of anti competitive behavior pricing its competitors out of the market before taking over those retail sectors. Amazons dominance has spooked some competitors into banding together to resist it, per the New York Times Walmart and Google have begun banding together to sell products via Google Express, though its not clear the move will have any impact. Ars Technica, Wall Street Journal.