Fifty years ago, an acquaintance came back from college, where he had been taking accounting or economics courses, and told his mother that should could save $x

Fifty years ago, an acquaintance came back from college, where he had been taking accounting or economics courses, and told his mother that should could save $x/year by buying the store-brand salad dressing. She replied that $x/year (probably under $10 then) wasn't worth it--she liked the name-brand salad dressing.