From Leamers book on Maco
humans are pattern seeking story telling creatures.
Economics cannot provide the level of certitude that the experimental sciences provide.The best it can do is look for patterns and then tell stories.
What if physics were like economics From Jim Manzi Uncontrolled:The surprising payoff of trial-and-error for business, politics and Society.
And how those stories vary-eg Milton Friedman and there is no free lunch versus the better than a free lunch claim that fiscal stimulus in an economy which has less than full employment will give a free lunch and will generate stillmore free lunches.(This from the advice that arose fromthe work of Lerner and Hansen taking Keynes thought and turning them into just about the coolest tool a politician or elected official could have ever received.)