Lodge and Pyrex are probably not the best examples - Lodge cast iron has gone down the tubes recently, making thinner pans with worse factory coatings, and Pyrex switched away from the high quality borosilicate glass they had used for decades to a cheaper formulation recently.

Patagonia has even lowered their standards somewhat - I know a guy who bikes to work every day in Seattle and has used the same Patagonia waterproof panniers for something like 15 years, and I would be willing to bet that new ones are more cheaply made and less waterproof, while costing more.