So, “Does the system behave the way we want it to behave?” is ultimately a moral question, one that we are banned from asking. In economics, this is exactly the sort of a question we’re not allowed to ask, because economics is supposed to be a positive science, not a normative science. The difference is clear: positive statements should describe things as they are (“facts only, baby”), whereas a normative statement describes things the way we want them to be.
Let’s take Milton Friedman, who was, of course, the biggest proponent of positive economics. He wrote the famous essay “Economics as a Positive Science.” In that essay, on the first page, you will find the following sentence: “Economics should be a positive science.” Now, please tell me if that is a positive or a normative statement.