Credit cards cost no more than 3%.. not enough to justify..
I like this chart.. maybe we can use this tool to bring down prices..
When store owners realize that their being exposed.. they'll stop taking advantage
+1
I recall one newspaper (maybe it was FJJ?) some years ago that used to post a supermarket price comparison, every week another product.
Of course they stopped at some point. If I had to guess, probably due to pressure from proprietors (who probably pressured rabbonim to pressure them with some sort of halachic excuse why it's unjustified).