So tldr; some people in a private focus group questioned the value of a 1/3 pound burger over the same priced 1/4 pound burger. It's not indicative of any system numerical illiteracy.
I will add there were no actual data released - it's solely based on an anecdote from a A&W restaurant executive.
https://skeptics.stackexchange.com/questions/28745/did-aw-cu...