The problems with shopping list questions have thoroughly been explained already, but recently I've run into the opposite problem: a product recommendation as an answer.
This answer is already very bad - it doesn't actually answer the question being asked, and it borders very near spam territory, even though I don't know whether or not the answerer has any affiliation with the source material.
Even if all those things were accounted for, is giving a product recommendation like this inappropriate for an answer in and of itself? Is it reason enough to flag the answer for moderation?