Magna Carta exercised a strong influence both on the United States Constitution and on the constitutions of the various states. ... Magna Carta was widely held to be the people's reassertion of rights against an oppressive ruler, a legacy that captured American distrust of concentrated political power.
A flexible expense is something that can be changed at any time. Vacation savings fits the mold of this, as it can be changed. It is not desperately needed, unlike the others.