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>b) We overturn the majority of our current social psychology knowledge and realize that yes, people actually do have absolute free will

Err... All current research suggests that you have almost no free will and are little more than a complex set of reactions to external stimulus.

Hence his comment. He's replying to people who claim all/most transactions in capitalism are willful actions by free, rational actors.

So there is no unexplained variance in behaviour and we have models that explain and predict it as good as let's say classical mechanics?

Free will is just a conceptual mistake based on metaphysics.