The U.S. Department of Justice is looking into beef prices. This investigation now includes several big retailers.

Companies like Walmart and Costco are part of this. They have been asked for information about why beef prices have gone up. The DOJ wants to know if some practices are unfair.

They are checking the whole beef supply chain. Several other companies are also being investigated. Further details about the investigation are available.

The companies involved include some well-known store chains. The DOJ is trying to find out what is behind the higher beef prices.