Sale pricing e Why do supermarkets offer sales several times a question year instead of all-year-round cheaper prices? Summary Companies find it more profitable to increase prices by a larger amount on an unpredictable basis Customers find it troublesome to avoid unpredictable price increases but easy to avoid predictable onesSale pricing The question Why do supermarkets offer sales several times a year instead of all-year-round cheaper prices? Summary  Companies find it more profitable to increase prices by a larger amount on an unpredictable basis.  Customers find it troublesome to avoid unpredictable price increases but easy to avoid predictable ones