In 2017, law student Lina Khan shifted the debate on Amazon and antitrust with a seminal paper called Amazon's Antitrust Paradox, which used Amazon's abusive market dominance to criticize the Reagan-era shift in antitrust enforcement, which rewrote the criteria for antitrust enforcement, so that antitrust no longer concerned itself with preventing monopoly, and only focused on "consumer harm" in the form of higher prices.

Big Tech is often in a monopoly situation (for example, Amazon's Audible owns something like 90% of the audiobook market), but even where they aren't monopolies, they are often monopsonies: a single buyer that controls the whole market that a variety of sellers want to sell into.

If you wear glasses, you might have noticed that they've been getting steadily more expensive in recent years, no matter which brand you buy and no matter where you shop.

In Labor Market Concentration, a new working paper from economists at U Penn, U Navarra and the Roosevelt Institute, researchers analyze a large US government data-set to determine how many workers live in markets where there is effective only one or two employers, a situation called "monoposony" (when a single buyer has a monopoly).

The debate over technology and disruption is a red herring, writes Glenn Fleishman. The trouble with Uber is that it's a middleman that can control both ends of the market.