Vladimir_Gritsenko comments on Individual Rationality Is a Matter of Life and Death - Less Wrong
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Perhaps I am prejudiced by poker (and games in general), but I see life as a constant series of decisions. The quality of those decisions, combined with luck, gives an outcome. Life is a game of chance and skill, in other words.
MAS rationality makes for better quality decisions, and thus makes for better outcomes. When there are institutional substitutes, I agree they can also make for better outcomes, but there are no institutional substitutes for the vast majority of the constant stream of decisions we encounter in life. I predict if you went through your day, noticed every decision you make (hundreds?), and scored them based on whether it is plausible that the decision could entirely be made via an institutional substitute, removing your own need to be rational completely, you would find almost none qualify. Those that do would be among the most important (medical decisions, how to invest your money), but some important decisions would remain (acting in an emergency situation).
One would also notice that almost never did one consciously use rationality techniques. Consider that we are already highly evolved to survive, and we are all descendants of survivalist winners. We have some baseline rationality hard-wired in us. It is this wiring that guides most of our actions, and it is there even if we don't have a single year of schooling.