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RE: What is the Most Valuable Thing You Have That No One Else Has But You could Not Sell It?
Ah... then Dale Carnegie Was Right: Smiling Changes Everything
Where I found?
https://www.inc.com/jordan-harbinger/dale-carnegie-was-right-smiling-changes-everything.html
So, it's this book?
Yes, it's a very interesting book. It's been in circulation over 80 years. I recommend it.