Thank you for using the Jiskha Homework Help Forum. Here are some websites on that topic:
1. (answerbag): http://www.answerbag.com/q_view/117263
2. (research): http://researchnews.osu.edu/archive/selfdout.htm
3. (Yahoo answers): http://answers.yahoo.com/question/index?qid=20080127153447AAq5G2l
4. (Broken Link Removed)
Many people around the world and in different cultures measure their worth and the worth of others in materialistic possessions. It's a visible way of showing that we're important.