Asymmetric price transmission

Asymmetric price transmission (sometimes abbreviated as APT and informally called "rockets and feathers", also known as asymmetric cost pass-through) refers to a pricing phenomenon occurring when downstream prices react in a different manner to upstream price changes. The simplest example is when prices of finished products increase promptly whenever prices of inputs increase, but take time to decrease after input price decreases.

Source: Wikipedia — Asymmetric price transmission (CC BY-SA 4.0)