Mistaken Opinion

Very intelligent people often make the [blank] of assuming that other people's minds work in the same way as theirs do. Economists, for example, create mathematically-based models on the [blank] that people act rationally as far as their own economic [blank] are concerned. You don't have to look much further than family and friends to see how off the [blank] this idea is. The problem with a lot of such scientifically-based theories is that they are not friendly to facts that don't [blank] the case.