When I go to the grocery store, why do I see them tossing out tons of perfectly good bread, boxed products etc? Presumably if the free market could reach equil

When I go to the grocery store, why do I see them tossing out tons of perfectly good bread, boxed products etc? Presumably if the free market could reach equilibrium then we would see only as much food produced as necessary, so then food waste should be minimized. Yet that's obviously not the case and we see vast amounts of waste.