Open the drawer next to your stove. The one with the foil and the wraps.
There is a box of plastic bags in there. There has been a box of plastic bags in that drawer for as long as you can remember.
You buy them without thinking. You never compare brands carefully. You would struggle to say what a box costs.
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That last part is the business.
A plastic bag with a groove pressed into it is one of the most reliable money makers in the American household, and the reasons why are far more interesting than a sandwich bag has any right to be.
Stay with me on this one. It pays off.