Subway spent a long time and a lot of marketing money training their customers that a sandwich should cost $5 and taste fine. Not great, but fine. But then the doubled the cost and halved the quality. They spent years teaching customers to avoid the sandwich they now serve.

Little Caesars had a similar problem, but instead of doubling the price, they raised it $1. Cheap pizza for $5 is fine, and cheap pizza for $6 still feels fine.