A well-known example of irrational decision-making people's tendency to overvalue the things they own (I would pay $1 for a coffee mug but will demand $5 for an identical coffee mug that happens to be mine). This bias of "the mind" is called the "endowment effect" and is often assumed to be universal (and therefore explained as the work of evolution). But in this paper Coren Apicella, Eduardo Azevedo, James Fowler, and Nicholas A. Christakis found that some people and some minds don't have this bias at all. Rather than being built-in to human nature, they write, the endowment effect may be a habit of mind that people learn in market-oriented societies. If that's true, it means that (for this trait at least) the hunter-gatherers described in the research were more rational before they were exposed to modern capitalism.Want to Make Hunter-Gatherers Irrational? Expose Them to Free Markets (Big Think)
I also wonder how much it has to do with indoctrination as well. Most of the nostrums about the "free market" are contradicted by people's experience on literally a daily basis (multiple competitive businesses, free choice of employers, etc.), yet people still believe in them without question. We have a word for that-religion.