This is very true. I worked at Traders many years ago and at least back then the store brands were often made by the same name brand company.

Agreed. I never worked there but have shopped there for many years, along with the other usual places like Whole Foods and Safeway. A game I used to play was "spot the TJ's store brand item under its own name at another store."

One example is TJ's French Village plain nonfat yogurt, which is very obviously Nancy's yogurt from Springfield Creamery in Oregon. Same exact taste and texture in the same packaging. (Nancy's used to come in clear plastic tubs like TJ's. A few years ago they switched to opaque white for their name brand, but it's still the same product.)

Another is some of the frozen Indian foods, which Whole Foods carries under the manufacturer's brand name.