In addition to all the other good answers, while there is waste and food that gets donated, supermarkets also minimize that by utilizing what’s called [“Just in Time” delivery,](https://medium.com/lifes-a-picnic/just-in-time-supply-chain-guaranteeing-freshness-and-minimising-waste-b21bd416b131) where they try to order exactly enough of each product that it runs out just as the new stock arrives.
They also reduce waste by turning about-to-expire products into new products – that raw chicken that is expiring tomorrow can get cooked into a “fresh store-made rotisserie chicken” or chicken tenders that can be put out for another few days. The steak that turned a little brown gets chopped up, marinated, and sold on a skewer as “ready-to-grill kebobs.” The bread nobody bought gets turned into croutons, the onions and peppers that are starting to degrade get the brown bits cut off and chopped up into pre-diced veggies, and so on.
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