Why Do We Value Things?

My wife grew up relatively poor in Mexico City. She shared a bed with her three sisters and never went to even a fast food restaurant, like McDonald's. Though her standard of living was much lower then than it is now, she grew up quite happy and placed a high value on what little she had. On our drive home from an evening out recently, my wife told me that she wanted to see our children value the things that they have. In answer to her question, we talked about the following.
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