The dictionary says Post Truth is the “fact or state of being post-truth; a time period or situation in which facts have become less important than emotional persuasion”. But I prefer to be direct – not to mince words – Post Truth is lying, plain and simple. It is making stuff up that is untrue, in denial of the facts, and, in cases where volition drives the lying, using strategic and well-thought out tools of psychological persuasion, fear, threats etc to make it look as though the statements are factual rather than lies. The interesting thing for me at the moment in this respect is that we are increasingly being told we are now in this Post Truth era. That social media has created this Post Truth era and that something should be done about it. Oxford English Dictionary announced recently that the Word of the Year 2016 is…, you got it, “post-truth” which they claim is a “concept … [which] … has been in existence for the past decade”. Its use has apparently “spiked in frequency this year” as a result of the Brexit referendum and the US election. Two things then are worth noting. First, there is nothing new about the idea of lying to influence public opinion. Indeed, as I will explain (briefly) the whole edifice of mainstream economics, including New Keynesian economics has been ‘post-truth’ since its inception. Second, the fact that it is getting attention now is because the establishment are starting to feel the pinch – their usual media power is losing traction with the democratising influences of the Internet – and their cosy worlds of influence are under threat from a rabble. And this applies to so-called progressive Left (the socialist politicians in Europe, the Labour politicians in Australia, Britain and elsewhere) who have so bought into the neo-liberal myth machine that they cannot understand why they are now losing support from their traditional sources (working class people). The ‘post-truth’ era is apparently upon us. But the reality is that there is nothing new about lying in mainstream economics. It is built upon a lie. It is just that the lying that is spreading on the Internet (‘fake news sites’) are damaging the establishment. That is why they are now complaining. They have never complained about the incessant lying from the economics profession.