"What does valuable mean?"

I had to ponder that question and figure out how to explain "valuable" to a child. How do you explain how worth is assigned, how we decide what has value and what doesn't? 

It all happened in the drive-thru lane. I handed her the sandwich and my five year old decided to hold on to the receipt. She was excited, like she had something worth keeping. I explained the receipt had no value and couldn't be used like money. "It is my check," she said, more than once. She didn't understand and kept asking why she couldn't use there receipt like a check.  I explained that it was not valuable. Which led to her question, "what does valuable mean?" I did my best to explain. "Then why do you keep them in your wallet?"

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