Rationaly Calculated Self Interest ( RCSI )

RCSI is basically a modified variation of Adam smith theory of self interest.
The theory that was propagated that, was all men are rational.. and what ever they do they have a tangible or a non tangible self interest .. the common non tangible being self satisfaction...

This theory is built on immense psychological aspect, Think of the monk who sold his Ferrari.. at first thought , that is absolute bogus and irrational.. but according to RCSI its self satisfaction from the sacrifice, is your self interest(in the book it was things like enlightment good health etc etc )
According this theory Every aspect of a mans action is governed by his self interest, and which by no means a negative aspect . A mother child relationship is usually thought as a self less act of love and affection of the mother, which actually is not , in the lady's mind deep inside there is a feeling of being a complete women which she derives from motherhood, the fact she feels good about the child, the feel good factor of being good mother.... that’s un tangible but is a self interest..this makes her happy
The essence of this piece is Even the most irrational thing in this world can be rational if it makes you feel good about doin the act

Hence there is no absolute rationality or irrationality ..Existentialism again

Existentialism and Political Theory

Existentialism and Political Science sounds a bit far fetched but honestly they are inter twined..
during intial stages of evolution of political theory through the concept of law and liberty .. it was this existentialism placed the ground work
when early Liberals where pressing against state and for Absolute liberty this how things shaped up:

the concept of liberty... what is liberty.. does the concept of absolute liberty exist... the answer is it cant as absolute liberty will trckle down to no bodies freedom.. as absolute liberty will also imply me encroaching some body elses frrdom.. so how do you take care of that..that was through law.. and law was then essentially based natural laws whats also called Aristotalian laws.. which brought abt the concept of State..as the enforcer of law

i think i tried to rest my case here
it all yours now