> a consequence of economic concentration
Yes. Good point. And the cost of starting a competitive company or even a competitive division within an existing company adds a buffer to Bezos' "Your margin in my opportunity." Secondly, it seems that domestic companies don't compete on price much anymore but want to take marketshare at or near the established high price.
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Decoupling from China has had an insulating effect on prices and margins, Debbie says.