I would consider the now-deleted question as squarely on topic here (specialized literature request), while the VAT-question example certainly off-topic.
The VAT question is a "bored to google - let's put economics.se to do it for me", since it just asks for a datum (or two, it doesn't matter).
The first, about EU policy, although ostensibly "purely factual" also, it refers to a complex matter for which most probably no "informative brochure/executive summary" exists, but only studies and research papers by experts who have gathered together and studied relevant EU official documents, synthesized them, analyzed them, and usually expressed opinions on them... which is applied macroeconomics and/or political economy. Such studies are usually not in the most public places even on the Internet, while it is possible that a member of the economics.se community could usefully guide the OP about where to find them, adding in the process useful content/resources here.
I believe @Ubiquitous is right: on this one, the line is not easy to be drawn a priori, and become "off-topic alert/on-topic guidance". Perhaps the per case close/downvote mechanism is the best approach.