The reason a price cut can signal weakness

A product drops in price and demand does not rise as the curve predicts. Some buyers wait instead. The reduction has told them something the previous price concealed: that at the earlier level, not enough people were buying, and the seller now needs the sale more than they need the product.

What everyone sees

Price is treated as the cost of acquisition, so lowering it should widen the market. That holds when quality is known. When quality is uncertain, the price is also the only continuous statement the seller makes about the product, and changing a statement invites the question of why it changed.

What is actually happening

Akerlof showed that when buyers cannot observe quality directly they price the average of what sellers are willing to supply, so any observable that correlates with quality becomes part of the inference. Bagwell and Riordan modelled the specific pattern of high and declining prices as a quality signal: a high price is sustainable only for a seller whose product survives inspection by early buyers, and the decline is informative about how much private information has already leaked into the market. In that frame an unexplained cut is not a gift. It is an update, and buyers reasonably read it as a downward revision of the seller’s own estimate of demand or of the product.

Why it stays hidden

The reading hides because sellers and buyers use different models of the same event. The seller sees a demand curve and expects volume; the buyer sees a revision and asks what prompted it. Firms therefore learn to attach a reason to every reduction — an anniversary, a clearance, a new model — because a labelled cut is a local event while an unlabelled one is evidence about the product.