Today living in most countries is not as simple as it was before. Economic systems, job markets, relations between governments and residents, are so complicated that usual equations can not solve them. To be able to afford in a society which offers different facilities and opportunity, every one works and tries to be a member of the chain that links all different parts of this system. I think if a teenager works while still a student, he will benefit from two major advantages. First he can support himself financially and second, he learns how to deal with other people in his society.
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