Few days before Christmas I came across to my mind one really interesting article in Economist. There is written about the deadweidht loss of Christmas and gifts in general. It is very short, but has nice analysis and shows how economic concepts could be used in different situations.
You can find it here http://bpp.wharton.upenn.edu/waldfogj/xmas_files/Economist%2012-20-2001.pdf
It is by the way a nice motion to run “This house doesn’t believe in Christmas” 🙂