Choose your emergency: paper products, bottled water after a hurricane, etc. Value is subjective; no item has an underlying True Intrinsic Price. When demand increases, the item becomes more valuable. The price should go up, at least in the short term. When held lower than the market price, runs occur and shelves empty. When allowed to rise, increased prices have a natural rationing effect to keep goods on the shelves for people who need them. Higher prices attract new providers, and the increased supply brings prices back down as circumstances return to normal.
Analyzed rationally, we see there’s no such thing as price gouging. The concept is an appeal to our base instincts.
When someone is selling a house, is the seller a “price gouger” for accepting the higher of two competing offers for the same house?
People don't want every single retail transaction to turn into a negotiation on the level of buying a house or taking a new job.
Grocery store margins tend to be thin. Where they really want you going is to the pharmacy, and surprisingly, what they want you to buy is generic drugs — more market segmentation. The name brand drugs tend to be really expensive. The generics are much cheaper in direct comparison, and for the store, the margin on generics is higher because name-brand prices create headroom. Yes, these broad generalizations have lots of exceptions, e.g., some generics are not perfect substitutes for name brand drugs, but the general pattern is there.