Is holiday giving an obligation?

Why do we suddenly become generous during the holidays? Why do gifts often bear greater symbolic than economic value? Why do we anonymously give to strangers?

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<p><a href="http://www.physorg.com/news148658159.html">Is holiday giving an obligation?</a></p> <p>Why do we suddenly become generous during the holidays? Why do gifts often bear greater symbolic than economic value? Why do we anonymously give to strangers?</p>