This year's hot retail term is the bullwhip effect.

It describes how dips or jumps in demand can get exaggerated by retailers, their suppliers and manufacturers. Take the pandemic darling, the air fryer. When demand suddenly rises, stores rush to avoid empty shelves, ordering a few extras just in case. Their suppliers also order extras from factories, which also make even more extras – until, abruptly, there are too many air fryers right as people are kind of done buying them.