For purpose of Economics we may perform the following deductions on IF.1.1, which are implications of Freud for Economists:
(I stands for Implications.)
D.1. Since Ego's main function is the self preservation, we may simplify it as: Ego is the Preference for Self Preservation.
D.2. Since Id is the cauldron of seething desires, we may simplify as: Id is the source of all preferences, or it governs them.
D.3. Since Ego is nourished by experiences, we may simplify it as: Ego is subject to the information set an individual has.
D.4. Since Secondary Process is problem solving, logical process at service of Id, we may simplify it as: Secondary process is Rational (or implies the Rationality) as in using all available information for the best outcomes.
Implications of D1 to D4.
I.1. Since Ego initiates the Secondary process, from D.1. and D.4. it follows that Preference for Self Preservation initiates Rationality.
I.2. Since Ego is subject to the derives of its first master Id, it follows from D.1 that Preference for Self Preservation is at service of Id, or is subject to the derives of the Id.
I.3. Since Id is indifferent to reason, and holds conflicting views together, it follows from I2 that Preference for Self Preservation is at service of a master indifferent to reason, and may demand conflicting outcomes at once.
I.4. From D.4 and I1 to I3., it follows that Rationality is at the service of that which is irrational, and purely desirous.
I.5. From D.2., it follows that the more experienced a man is, the stronger the Ego is, and thus lesser the chances of submitting to the derives of Id, and preference for self preservation grows stronger.
I.6. Since Id is impervious to experience, it follows that at any extension of experiences, the preference for self preservation faces the same risk of being overridden by another derive from the Id.
I.7. Since Secondary Process is initiated by Ego, and Ego is subject to Id, it follows that Rationality can not be an elementary or primary axiom of any analysis because it is a consequence of a preference of self preservation which itself is subject to its source Id.
E.1.: The nature of preferences is that they may dominate on one another from time to time for reasons which can be numerous, and thus if rationality is consequent of a preference – the preference for self preservation – rationality may be given up, if its enforcing preference is dominated by another preference for reasons which may escape our attempts to understand.
I.8. Man is primarily a behavioural being subject to the derives of an amoral, irrational Id from where all preferences emerge along with a preference for self preservation which initiates secondary rational process only to serve demands of Id.
I.9. Rationality by being a consequent of a preference - the preference for self preservation - cannot be treated as an elementary axiom of any model of human personality.
I.10. All motivated behaviour of man, which is the scope of economics, is subject to human nature, or personality.
I.11. Thus, no preferences can be judged to be rational, unlike a textbook Economics, because preferences pre-exist even before rationality – secondary process – comes into existence, and one of them – self preservation – triggers rationality – secondary process.
I.12. Let a simpler expression for any study in Economics in line with the aforesaid (D.1 to I.11) be Behavioural Study, and a study which presupposes that people use all available information for maximization of self interest free of any influence of Id, ignoring its influence or role, be Rational Study.
D.5. The Subjectivity of Ego to a Pre-existing Id, its triggering of the Secondary Process, and irrational impervious nature of Id, implies Primacy is of a behavioural study, and not of rationality study.