I joke sometimes that the great thing about tech monopolies is how many there are to choose from, but it's actually a real theoretical problem. How does competition theory and market definition work when the biggest competitive threats come from other markets?
Microsoft destroyed IBM's monopoly, and never made mainframes. Google's biggest competitors are FB & Amazon, not Bing. Amazon zoomed past eBay without doing auctions, and now worries far more about Shopify than Jet.
Companies being sued under competition law alway argue for the broadest possible market definition. But would you really want to stand up in court and argue that Sundar Pichai spends more time worrying about Bing than Amazon?
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