I recently saw a John Oliver segment on YouTube about chicken farmers. They're invariably under contract to one of the big four chicken corporations, and these contracts are never to the farmers' benefit. In other words, the farmers are suffering exactly like Rob Wallace describes above. Therefore, I certainly believe what Wallace says, and according to Wallace, this "capitalist agribusiness," designed to exploit the poor farmer, is widespread in US agriculture, not just on chicken farms.
Understanding the True Cost of American Food (Part I)