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A hundred years ago tanned skin was was a sign of manual labor, work in the fields and thus exposure to the sun.
White skin was a sign of high status and being able to stay home, and not work in the sun.
nowadays tan i sa sign of high status meaning you have the time to go out and experience life and nature,
while having no tan means that you are stuck most of the day in a grey cubicle like a low status slave.
Side note:
white skin looks healthy when the diet has lots of minerals and vitamins, and it gains the "golden" glow.
Tanning can achieve a similar look with a shitty diet.
tl;dr - tan is a fast and cheap way to look healthy and of high status.