Google is unambiguously a monopoly - they have a 90%+ market share in search. Whether or not they're engaging in anti-competitive behaviour is the big question

Google is unambiguously a monopoly - they have a 90%+ market share in search. Whether or not they're engaging in anti-competitive behaviour is the big question - whether or not they have a monopoly in search is not really debatable. For example Standard Oil, the 20th century poster child for monopolistic abuses and origin of modern anti-trust law also had a market share of ~90%. [EDIT because I found bad data about Walmart] Walmart is definitely also a monopoly or close to it - they have a share of ~70% of the grocery market, and should also be subject to restrictive antitrust rules, or even broken up. They don't have a monopoly in online retail where Amazon controls over ~55% of the market. But the fact that Walmart has a monopoly in one industry does not say anything about possible anti-competitive behaviour by Amazon in another. Amazon's not quite a monopoly in online retail yet but it's definitely trending in a worrying direction.