Once you lower the price of a product, you can never raise it again. I heard that on/around HN at some point and I haven't seen it proven wrong yet. There's a reason why chip bags get smaller, why new versions that seem identical to the old come out, why Tommy Hilfiger will never be a prestige brand again. And it's because customers don't tolerate raising prices.
https://www.vice.com/en_us/article/evk75k/the-slow-death-of-...
> It’s a beautiful system, but it’s quickly vanishing from the city’s food landscape right from under our noses. The spots that used to churn out this style of pizza, many of which still have the awnings over them marking them as $1 slice establishments, are giving way to outside forces and silently raising prices to $1.25, $1.50, and even two dollars per slice.