The concentration problem is well known in the egg industry but also in the meat industry in general ( Cargill, Tyson Foods.. ) In the past, most farms were independent and the distribution was also very broad. If a couple farms got egg problems ( an example ), the overall market wouldn't even notice other than their county. Now the "farms" are HUGE if a couple ones run into troubles the entire State suffers and the whole national market feels it.

Also, many of the "independent" farms in reality run with a single-"customer" contracts and the margins squeezed to the max in a way they even need to borrow huge amounts of money just to stay afloat and don't breach their contracts with huge conglomerates like Tyson. In practical terms the supply side for the quarters is decided by a couple managers who work for these big food companies which have their own "tough" contracts with retailers like Walmart, Target, etc. So if the manager happens to be a dipshit or making a bad move the consequences of that are national. And I'm not even talking about shoving MILLIONS of animals packed in a couple acres. If one coughs..