Human cognition is the entity which should be regarded uniquely. In order to advocate that, two ideas are considered: the idea of iterations, which allow us to predict empirical phenomena - it is shown how different empirical phenomena urge us to make the according sorts of predictions - and it is shown that iterations also allow us to avoid contradictions in logic. The other idea that is put forward is the idea of competition taken in the broad sense. these ideas are conceptually connected and they make us assert that we have to use one and the same way of knowledge obtaining in all our activities; in particular, we might assert that we do the same in empirical research and in economic operations. Thus, we infer, traditional economic attitude cannot be change, nor corrected.