Gary Stevenson is also an overconfident blow hard who thinks because he made money on the stock market he knows more than everyone. I'm a psychologist not an economist, I don't like economics, but this is all still wildly off base from what actually happens in academia. Economist don't run randomized control trial (RCT) style experiments. They use completely different techniques with different statistical methods to test assumptions. Are these as high quality for causal reasoning as a RCT study? No absolutely not. However I think the average person would be shocked at how much of every field of science does not confirm their studies to that gold standard and how difficult it is to match that exact specific scenario statistically.