This 2006 post from Will that I recently happened upon for the first time manages to say with much more clarity and eloquence something I sort of tried to say recently:
Economic laws, like the principles of all the “special sciences,” are ceteris paribus generalizations: generalizations that are true other things being equal. Econ 101 lays out the basic laws and explains what follows from them ceteris paribus. Later, students learn about cases when other things are not equal — when there are exceptions to the generalization.
….you will be utterly hopeless in reliably identifying exceptions to a ceteris paribus law when you never grasped its logic in the first place. Exhortations to mind your Econ 101 generally aren’t exhortations to stop being so darn advanced. They are exhortations to actually comprehend the principles upon which advancement depends. And, second, the fact that a law is ceteris paribus does not mean you can deny its applicability whenever you want to. Political convenience tends not to be an appropriate auxiliary condition. You can’t wave your hands and just hope that a good argument is in some upper-level textbook you haven’t read.
If you want to say that a wage floor is not going to throw some low-wage workers out of their jobs (or prevent them from getting jobs), you’ve got to say, in a principled way, why not. The burden is on those who predict an exception to an immensely reliable regularity.
This is not meant to be a post about the minimum wage, but a post about econ 101 and it’s exceptions.