While President Donald Trump's proposal to import more beef from Argentina is billed by the administration as a way to bring down prices for American consumers, critics say it misses the real issue driving costs at the grocery store: corporate concentration in the U.S. meatpacking industry.Four corporations — Tyson, JBS, Cargill and National Beef — anchor the U.S. beef supply chain, with pricing power that reaches from pasture to plate. As a result, the gap between what producers are paid for cattle and what consumers spend on beef has remained wide, a reflection, economists say, of how market...

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