Economic psychological effect is actually too much... can saying in the life is everywhere is seen.
An unit is changed to have distinct effect in metage for example.
Assume you go food market buys food, an inn is quote a jin of Chinese cabbage 1 yuan of money, another inn tells you 79 Chinese cabbage 5 wool money, do you choose to which go to?
Can great majority person choose to go to the 2nd? However tweedledum and tweedledee of tweedledum and tweedledee, two price is same actually, the contrast that is the data in unit price only lets your simple consciousness think latter compared material benefit to stop.
However the effect that I prefer calls appearance effect.
Someone cries him to take face effect, what makes take outer part?
After people puts forward a big request to be rejected, a small request has reintroduce to may be accepted more greatly.
Emmmm
A: "Can you borrow me do 5 let me buy a rubber? "Can you borrow me do 5 let me buy a rubber??
B: "Don't you have Emmm 5? "Don't you have Emmm 5??
A: "Ah, then you can lend me your rubber... "
B: "... row "
This is a quite coarse example, but this also is a society in the main human in a road of established by usage, it is psychology abstracted it only come out, summary became the law.