Jeff Atwood on Nostr: "Economists have a metric known as the “four-firm concentration ratio,” sometimes ...

"Economists have a metric known as the “four-firm concentration ratio,” sometimes deployed in shorthand as “CR4.” It is a measure of competitiveness in a market for goods or services. When four companies gain a combined market share that is greater than 40 percent, an oligopoly has formed." https://www.theatlantic.com/ideas/archive/2024/04/food-industry-monopoly-power/678005/