Mandate problems

Megan McArdle complains the problems setting the 30-hour standard for full-time work - and the new problems that created.
This is related to a regulatory phenomenon that I think of as “building a fence around the law.” I stole this concept from what people who keep kosher call “building a fence around the Torah.” There are a lot of ideas wrapped up in this concept, but one of them is that you take steps to ensure that you can’t break a commandment -- you enact rules that are stricter than the ones found in the commandments, so that you can’t break a rule accidentally, or accidentally-on-purpose.