Orrel is not the only one that keeps saying this but economics is not a science like physics though it's one of the most widespread believes. This misconception is thus confuted using rational argumentations and few technicalities. Also very interesting the discussion of the relationship between economy end ecology which is constantly disregarded and nature is never computed in the economic calculations.
The book flows very well and it's of the right length. Highly recommended to those who don't know much about economics and want an alternative point to view the one provided by economists that trust a claimed-as-science discipline that keeps failing predictions.