What is your mother worth?

I have a five-year old Princess. Lately, the little lovely has been rather prone to fits of temper when she does not get what she wants. As I am not an overindulgent Queen, this is more than a daily occurrence.
Yesterday, we visited the brand new Disney store in our local mall. My little Princess was in raptures. There were some wonderful new store opening deals, but the line was outrageous, and we were not dealing with an unlimited amount of time, so her eloquent pleas were met with a regretfully negative response.
"Sweetheart, I'm sorry, but we will not be getting anything at this store today. Do you see that line? I am not saying you can never have it, just not today. Put it all on your Christmas list."
*ear-shattering wails from delicate little Princess*
"You hate me, I know it! You never give me anything I want! I know you don't like me! You are so mean!" etc, etc all the way out to the car and all the way home.

This rather reprehensible sort of behavior has been coming and going for the last few days, and is rather testing the limits of my sanity! So, as she was getting ready for bed this evening I sat her down and we had a talk. She told me--again--that her misbehavior was caused by my not giving her what she wants. And, I told her--again--that if she was only going to be good or happy when she had everything she wanted, she would never be happy. And, being a rather ambitious parent at times, I tried to explain to her the value of virtue, integrity and moral fiber. Trying to explain to a five-year-old that your good name is worth more than a desired material possession is difficult... good values are rather an abstract concept... So, in an effort to make a comparison that would make sense to her I asked, "Would you trade Mommy for a Barbie?" She thought for a moment, smiled a little, and asked hopefully, "What kind of Barbie?"

Scruples, anyone?

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BTW, in case you are wondering, the talk did not end there, although I think that question was rather a defining moment in my life as a mother. I think we made some progress, but she still wants a Barbie.