John Stossel on the win-win nature of voluntary exchange

We see this every time we buy something.  The seller's there for his own self-interest and so am I.  So why do we both say, "thank you."  Because he wanted the dollar more than he wanted the pretzel.  I wanted the pretzel more than the dollar.  The transaction doesn't happen unless both of us think we win.  And that way, voluntary transactions create wealth.

~ John Stossel, "In Defense of Capitalism," Stossel TV, 4:00 mark, June 18, 2019