The theory behind "Your Choice" from American Airlines is to give their customer choices. One can pay a low price, but pay additional fees for the amenities they want. Therefore, if someone doesn't want or need certain amenities such as being the first to board, they do not have to pay extra for it.
Something the airlines have never heard of.
Almost all of the theory behind the American system of government was developed long before George Washington discussed it with Native Americans. The main Native American contribution was to show that such a government actually worked in practice for a secular government and not just for a religious one.
The scientific theory behind cell theory is that it explains the fundamental properties of all cells. The cell is the basic unit of all living organisms.
compare glasser's choice theory on wants versus needs
compare glasser's choice theory on wants versus needs
With respect, I do not think there is any theory behind the country.
Routine activity theory is convergence of motivated offender, suitable target and absence of a capable guardian. It relates to Rational choice in that they both explain crime and criminality.
The Domino Theory was the driving force behind the Kennedy administrations actions in Vietnam.
The Domino Theory
1974 - Repetto
Electrodynamic theory.
The rock cycle?