(food companies all raise prices.)

And then some smaller company goes, "wait a sec, you're telling me I can increase my market share a bunch if I don't raise prices? Cool, let's do that. I can make a bunch of money on volume." And then some other company does the same thing, and so on until they all do. UNLESS an input into that industry has gone up in price and they all have to raise just to stay afloat. Then we're back to talking about inflation, supply chains, and money supply instead of companies just choosing to raise prices due to greed or something.