I have seen criticism in the past (don't remember where) of how economics uses a lot of complex math to give it the same patina of legitimacy that the hard sciences have, when it is in fact not an exact science.

mudbloodvonfrei

bitcoin

Just got my copy of Saifedean's new book

A few pages in. Laying the foundation for human action and that is at the heart of economics and how you can’t really experiment economic theories like you can with physical sciences because conditions change constantly and dealing with peoples lives. So it is really hard to set a good reference frame to really gauge economic activity. 

Like this whole GDP metric! 